If you have assigned LT or RT on your controller to SecondaryAttack (to aim), you will be able to recognize it by doing the following settings.
Assign a keyboard key to LT (or RT) using JoyToKey or something what can assign keyboard to controller.
You can use steam controller setup too. I don't know about that.
As an example, LT (Button 11) is assigned F10.
Specify the DirectX Scan Code of the assigned keyboard key in Hot Keys and SecondaryAttack DirectX Scan Code of MCM.
For F10 it will be 121.
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But there does appear to be another bug from the game itself. Because I assume due to joytokey, when you open the pip-boy menu if you hit the controller button which is binded in joytokey, it might make your controls to stop working until you use the keyboard
Someone might find this useful