deno.path doesn't resolve environment variables

[Xernisfy]

The setting "deno.path" doesn't seem to resolve environment variables.

In my settings.json I want to use an environment variable to resolve to deno.

Basically what I would like it to work with:
"deno.path": "${env:USERPROFILE}\\Applications\\deno\\deno.exe"
or
"deno.path": "%USERPROFILE%\\Applications\\deno\\deno.exe"

But it does work with an absolute path:
"deno.path": "C:\\Users\\<username>\\Applications\\deno\\deno.exe"

I tried this with the global settings.json and a workspace file.

Expected behavior

The environment variable should be resolved and enable the extension to find deno.

Screenshots

Versions

vscode: 1.54.3 (user setup)
deno: 1.8.2
extension: 3.2.0
os: Win10 build 19042

[kitsonk]

Currently vscode does not provide a service that does this (see: microsoft/vscode#2809) though I would really want something that is provided to extensions that would make this automatically work instead of trying to build it ourselves.