This is not planned for the next 6 months, but is on the roadmap.
Currently, you can use “App Registration” blade in the Azure Portal (outside of the Azure AD B2C blades) to register an apps that define application permission and the register apps that use client credentials to request these. The caveat is that this is done using the same mechanism that you’d use in regular Azure AD.
Ideally we’d have a first class experience for this in the Azure AD B2C blades or at least have an Azure doc that walks you through the experience I just summarized, so I’m leaving this feature ask open.
It would be great if you guys can add comments with your feedback. What scenarios areyou trying to achieve? Does the approach above help you achieve what you want to achieve? Does the experience to do so work for you guys and if not, what would you like to see?