How would you set up a control knob like that one in Among US?
That one on the lower left corner of the game.
https://www.slythergames.com/wp-content/uploads/2020/09/Among-Us-How-to-Play-With-Friends.jpg
It's often called a thumbstick control or a a virtual joystick.
Here are a few examples:
howtoconstructdemos.com/category/virtual-joystick
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Here's another example as well.
dropbox.com/s/an2pbq49au6rkxd/thumb_sticks_2.capx