diff --git a/helm-chart/binderhub/schema.yaml b/helm-chart/binderhub/schema.yaml
index e9058b2b9..f55ffd1df 100644
--- a/helm-chart/binderhub/schema.yaml
+++ b/helm-chart/binderhub/schema.yaml
@@ -25,7 +25,6 @@ required:
   - service
   - config
   - extraConfig
-  - templates
   - jupyterhub
   - deployment
   - dind
@@ -33,6 +32,7 @@ required:
   - ingress
   - initContainers
   - lifecycle
+  - extraFiles
   - extraVolumes
   - extraVolumeMounts
   - extraEnv
@@ -261,13 +261,36 @@ properties:
       manifest as either the binder pod going into `Error` or `CrashLoopBackoff` states, or in
       some special cases, the binder pod running but... just doing very random things. Be careful!
 
-  templates:
+  extraFiles:
     type: object
-    additionalProperties:
-      type: string
+    additionalProperties: false
     description: |
-      Custom HTML page templates for BinderHub,
-      e.g. page.html.
+      A dictionary with extra files to be injected into the binder pod's container
+      on startup. This can for example be used to inject: configuration
+      files, custom user interface templates, images, and more.
+
+      See zero-to-jupyterhub's extraFiles documentation for reference.
+    patternProperties:
+      ".*":
+        type: object
+        additionalProperties: false
+        required: [mountPath]
+        oneOf:
+          - required: [data]
+          - required: [stringData]
+          - required: [binaryData]
+        properties:
+          mountPath:
+            type: string
+          data:
+            type: object
+            additionalProperties: true
+          stringData:
+            type: string
+          binaryData:
+            type: string
+          mode:
+            type: number
 
   jupyterhub:
     type: object
diff --git a/helm-chart/binderhub/templates/deployment.yaml b/helm-chart/binderhub/templates/deployment.yaml
index e3b86a83e..bd9020a7c 100644
--- a/helm-chart/binderhub/templates/deployment.yaml
+++ b/helm-chart/binderhub/templates/deployment.yaml
@@ -45,14 +45,19 @@ spec:
       - name: config
         secret:
           secretName: binder-secret
-      - name: templates
+      {{- if .Values.extraFiles }}
+      - name: files
         secret:
           secretName: binder-secret
           items:
-            {{- range $filename, $contents := .Values.templates }}
-            - key: "templates-{{ $filename }}"
-              path: {{ $filename | quote }}
+            {{- range $file_key, $file_details := .Values.extraFiles }}
+            - key: {{ $file_key | quote }}
+              path: {{ $file_key | quote }}
+              {{- with $file_details.mode }}
+              mode: {{ . }}
+              {{- end }}
             {{- end }}
+      {{- end }}
       {{- if .Values.config.BinderHub.use_registry }}
       - name: docker-secret
         secret:
@@ -80,9 +85,14 @@ spec:
           - mountPath: /etc/binderhub/config/
             name: config
             readOnly: true
-          - mountPath: /etc/binderhub/templates/
-            name: templates
-            readOnly: true
+          {{- range $file_key, $file_details := .Values.extraFiles }}
+          - mountPath: {{ $file_details.mountPath }}
+            subPath: {{ $file_key | quote }}
+            {{- with $file_details.mode }}
+            mode: {{ . }}
+            {{- end }}
+            name: files
+          {{- end }}
           {{- if .Values.config.BinderHub.use_registry }}
           - mountPath: /root/.docker
             name: docker-secret
diff --git a/helm-chart/binderhub/templates/secret.yaml b/helm-chart/binderhub/templates/secret.yaml
index ee905dcee..bedffae26 100644
--- a/helm-chart/binderhub/templates/secret.yaml
+++ b/helm-chart/binderhub/templates/secret.yaml
@@ -18,15 +18,18 @@ stringData:
   values.yaml: |
     {{- pick .Values "config" "cors" "dind" "extraConfig" | toYaml | nindent 4 }}
 
-  {{- /* Custom HTML templates */ -}}
-  {{- range $filename, $contents := .Values.templates }}
-  templates-{{ $filename }}: |
-    {{ $contents | nindent 4 }}
-  {{- end }}
-
   {{- /* Glob files to allow them to be mounted by the binderhub pod */}}
   {{- /* key=filename: value=content */}}
   {{- (.Files.Glob "files/*").AsConfig | nindent 2 }}
+
+  {{- with include "jupyterhub.extraFiles.stringData" .Values.extraFiles }}
+  {{- . | nindent 2 }}
+  {{- end }}
+
+{{- with include "jupyterhub.extraFiles.data" .Values.extraFiles }}
+data:
+  {{- . | nindent 2 }}
+{{- end }}
 ---
 {{- if or .Values.config.BinderHub.use_registry .Values.config.BinderHub.buildDockerConfig }}
 kind: Secret
diff --git a/helm-chart/binderhub/values.yaml b/helm-chart/binderhub/values.yaml
index 3520a9ff3..91c0eb127 100644
--- a/helm-chart/binderhub/values.yaml
+++ b/helm-chart/binderhub/values.yaml
@@ -41,7 +41,7 @@ config:
 
 extraConfig: {}
 
-templates: {}
+extraFiles: {}
 
 # Two bits of config need to be set to fully enable cors.
 # config.BinderHub.cors_allow_origin controls the allowed origins for the
diff --git a/testing/k8s-binder-k8s-hub/binderhub-chart-config.yaml b/testing/k8s-binder-k8s-hub/binderhub-chart-config.yaml
index 5df1079c7..e9d29bfdc 100644
--- a/testing/k8s-binder-k8s-hub/binderhub-chart-config.yaml
+++ b/testing/k8s-binder-k8s-hub/binderhub-chart-config.yaml
@@ -18,13 +18,15 @@ config:
     log_level: 10
     cors_allow_origin: "*"
 
-templates:
-  page.html: |
-    {% extends "templates/page.html" %}
-    {% block footer %}
-    {{ super() }}
-    <span>test-template</span>
-    {% endblock %}
+extraFiles:
+  page.html:
+    mountPath: /etc/binderhub/templates/page.html
+    stringData: |
+      {% extends "templates/page.html" %}
+      {% block footer %}
+      {{ super() }}
+      <span>test-template</span>
+      {% endblock %}
 
 ingress:
   # Enabled to test the creation/update of the k8s Ingress resource, but not