Metahuman Animator on custom character (the facial description standard)

Hello everyone! I’m making a budget for a project and the team wants to know if it is possible to use metahuman animator on a custom character, I saw on the animator launch post this:

so is this “facial description” these shapes?

if so, if my character has these blendshapes it will work with metahuman animator?

many thanks in advance
best regards.