How to enable bEnableAsyncInitBody ?

Hello I am working with dynamic meshes and procedural meshes in async thread. But adding a lot of triangles creates a big fps drop. With procedural mesh the simple thing of CreatingMeshSection even with few triangles create a drop. Then I wanted to use async tasks to not freeze the Game Thread (with FNonAbandonableTask). But when trying to create a mesh section or when appending buffers to a dynamic mesh. A crash occurs with error Assertion failed: Chaos::CVars::bEnableAsyncInitBody || bIsInGameThread [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\PhysicsEngine\BodyInstance.cpp] [Line: 1552]. So then I wonder how I can make bEnableAsyncInitBody True and if I cannot, what are the other possible ways.