Managed Apple-ID and App Installations (in-app purchase)

We started using Apple Business Manager (ABM) and Jamf Now as MDM.

I want to use some apps that require in-app-purchase in order to enable full features.

But in :

Intro to purchasing content in Apple Business Manager – Apple Support (UK)

It says:

Note: In-app purchases and subscriptions are not compatible with volume purchasing, Managed Apps or Managed Apple IDs. Developers may offer a separate full-featured version of their apps (sometimes as a Custom App) for education or enterprise customers that need to deploy apps at scale.

I assumed that this all is a professional solution. But there seems to be no way to use apps that require in-app purchase.

How is it possible to solve this problem?

I am forced to create a "private" (unmanaged) apple-id to use full functionality...