.dna file in maya

Could someone at Unreal share a way to generate a .dna file for a character head?.
We at Breda University are trying to use our own scanned head with the metahumans rig with limited success and we have found that the .dna file sets up the constraints and limits for movement .Could someone at Epic share some information for a way for us to be able to generate a custom .dna file.



I am currently doing the same thing. Basically we would like to use our own head mesh to replace that of MetaHuman while still using the expression system of MetaHuman.

Up till now I only work with unreal engine and blender. Do you mean that .dna file is essential to using control rigs?