want to move hand to fist - with make target

i want to use make target to get a slider for change the pose from open hand to fist
i saw the video "T-Pose with makeTarget" on youtube -> is it really necessary to make a new armature for the MakeHuman Model to use MakeTarget ?
thank-you for helping
i saw the video "T-Pose with makeTarget" on youtube -> is it really necessary to make a new armature for the MakeHuman Model to use MakeTarget ?
thank-you for helping