Hello Ron Weasley,
Thanks for your question.
You are correct. The API primarily returns logs related to user provisioning. This API retrieves a list of user provisioning summaries. For specific group provisioning, you generally see them under audit logs.
https://learn.microsoft.com/en-us/graph/api/directoryaudit-list?view=graph-rest-1.0&tabs=http
Please let me know if you have further questions**
You can mark it 'Accept Answer' if this helped.