An example custom field that is registered depending on custom buisness logic

[pdonchev]

As a developer I need to be able to explicitly set the field type at dynamic content type level. For example - the old way was to pick a "Custom" for field when creating the field. This could be achieved partially by specifying the type and the field in the admin app extension but comes at a cost - each time I want to add a field with that selector - I will have to go to the admin app, add the type and field name there and re-build it. A configuration in Sitefinity that ties dynamic type and field name to a specific custom field + an endpoint to allow the admin app to fetch this information from Sitefinity could be a solution here?