Access Review on multiple Management Groups and Subscriptions

Hi everyone,
We are facing the challenge of managing numerous Subscriptions and Management Groups in Azure. Our goal is to make Access Reviews more efficient by conducting them at a higher level, such as the Tenant Root or a central Management Group.

Additionally, it would be ideal if roles like "Global Administrator" or "Owner" could be centrally configured for such structures (Tenant Root => All Management Groups => Subscriptions) to reduce administrative effort.

Does anyone have experience or tips on how to optimize Access Reviews and role configurations for large and complex Azure environments? 

Thanks in advance for your help!