I have created a custom [Connected entity profile] on the accounts section that is a duplicate of the primary contact connected entity, except the text displays: Billing Contact:
But am unable to set the default image ?? (I.e. I want the billing contact to have the same icon as the primary contact when an entity is not yet selected for the field ...):
Please feel free to set any default image in the configuration section. In order to do it open the billing profile schema and upload the needed image in the BlankSlateIcon property. Save the schema and clean the cashe.