How to get a bone location for the first frame of an AnimMontage?

hi all! maybe get bone location could help my problem , anyways is about metahuman , last step face post animation blueprint , theres only a pose connected to control rig … ok whatever try offset joints before this is useless , joints are blocked , after control rig can apply transform bone and can move freely the joints like i want ear more far from face… but one by one and not precise , i did some animation in maya to move the joints to some place i want , i try plug apply additve between control rig and new animation , i want control rig joints to offset move to some other joints pose i give thru animation but gets deformed , any way to make this additive joints animation works? the things seems have to be after all this contrl rig , if try add it in the sequencer or whatever is useless…