Microsoft 365 Copilot access to planner tasks?

I try to get Microsoft 365 Copilit access to existing planner plans and it's tasks. Read and possibly write access. 

How would I do that? 

I only have basic plans that are used in our team. Do I have to convert them (if that is possible at all) to the plans with project manager?

I tried Project Manager. That seems to be an enhanced plan. Can I migrate? Does it need additional licenses?

Dan