How to bake displacement map with multi res

Hi, i am trying to bake displacement map i tried lots of think but didnt work

some guy made it with geometry nodes but there is bake displacement map options it doesnt work it only shows white texture.

I tried set displacement only and added multires to my object. Didnt work
1.blend (1.2 MB)

Okey i have done it use color ramp for displacement then use color ramp for baking emit but you should set midlevel to 0 otherwise there will be displacement but it will be a little bit different from original. put color ramp to surface