It must be possible to create an asset reference as a property in a content type by only providing simple configuration in a CT model definition.

Currently it is quite complicated - one must:

1. Retrofit the assets app as a CT-based app.
   • Create a minimal CT for the assets workspace. 
   • Decorate the Assets app to add a "contentType" field and change the class.
2. Define a property with type "Asset" on your custom content type.
3. Provide almost the full field configuration in the app file in order to have the asset link stored properly and also to have a proper preview. (See config sample below)

              image:
                targetWorkspace: dam
                identifierToPathConverter:
                  class: info.magnolia.dam.app.assets.field.translator.AssetCompositeIdKeyTranslator
                contentPreviewDefinition:
                  contentPreviewClass: info.magnolia.dam.app.ui.field.DamFilePreviewComponent

Developer should only have to perform step 2 in the above list.