HELP / ADVICE NEEDED / Connection webcon -> OAuth -> Dynamics Business Central

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Hi there,
ever since OAuth2 connection was implemented I was happy and thought it would make connecting to Dynamics BC (Saas / Cloud Version) a breeze.
However, so far, it was / is not.
setting up the OAuth2 app authentication in Azure and webcon is pretty straightforward.
- it works like a charm in Postman ( I get my bearer token back) but I have no real way to test it in webcon, so I have to assume it´s working.

then you still have to set up the REST Web Service connection, then the actual Rest Web Service Data Source. but it is not possible to get the actual response layout.

I am at a loss.

has anyone successfully connected Webcon with Dynamics Business Central ?
Could anyone provide some insight (maybe even screenshots) on how to configure the Connection and Datasource(s) ?

All I want is use some published API webservices to inflate list items or use some webservice data as sources for dropdown fields....