How can I mirror the Face expressions on Metahumans?

Hi! I am using the ARKit Livelink to map face expressions on Metahumans, but I want the behavior to be mirrored. For example, when I blink my left eye, the avatar to blink her right eye, like I would look into a mirror. How can I achieve this?

I tried to swap the left and right animation curves used by ARKit livelink in the mh_arkit_mapping_pose and Face_Archetype_Skeleton and it works. But when I reopen my Unreal project, it seems the curves are overriden with the default ones.