How to add Shape Keys on Multires Modifier?

I applied the Multires Modifier to my model and tried to add Shape Keys to sculpt skin details
.
However, Shape Keys could only be add on a basemesh without Multires.

I searched the forum and there were users who had the same problem, but there seemed to be no solution.

How to create Shape Keys on a model with Multires Modifier?

I want to make Shape Keys that can enable/disable details on Multires. (like making on basemesh)

Any method is fine as long as it is possible.

Please advise.