is there a way to add force to a socket instead of a bone?

hello, i’m triyng to add for to a socket of my player character.

the model is a woman and i like to add a little bit of bounce to her breasts when she is walking or running, i have rigged the model with the mixamo autorig, after import it on ue4 i have added to the model two socket for each breast, just want to add some force or impulse to the socket to simulate the move of the breast when the player is walking or running.

i tried using the node Add Force At Location using the socket name as Bone name, but has not effect on the socket, the breast is not moving.

Any idead on how to accomplish this ?

thanks in advance for all the help.