How do I export an fbx posed character from sequencer?

Hi guys - I am trying to export poses for Marvelous designer.

We are animating our characters in Unreal using mixamo animations, and playing these in the sequencer. I would like to be able to export different poses of these characters directly from a specific keyframe the sequencer. The export should be an fbx with bones and animation data (so I can then copy the pose as an animation in blender). I’m a newb at this so any help greatly appreciated! Thanks in advance