Hey @brs-sebascova ! I am currently trying to export an fbx file of a hand from Blender to Unreal. However, I am having trouble with the skeleton and bone weights when using the normal export tool (Unreal only recognizes two fingers for some reason). I used this plugin you mention and managed to export the whole hand but now each piece is separated. I don´t know if maybe you have information regarding this type of export.
UPDATE: I already solved it, thanks anyway!