API UOD (User Owns Data) authentication pop/up or silent refresh

[BIJB]

Right now for User owns data embedded, a user  needs to go to app.powerbi.com in order to get authenticated by the access token retrieved from MSAL. Create a way to authenticate a user in power bi utilizing an api so that when we retrieve the access token a user does not need to go to app.powerbi.com in order to be authenticated in power bi, the api has already authenticated them.

IE. go to angular app -> API authenticates user in power bi -> angular app goes to azure to retrieve access token -> angular app embeeds power bi report.