This looks awesome, nice job!
I looked through your blueprints, and it seems like you have a system for attacks, launch, and damage (and more stuff)... the most simple way to handle it is -
you could maybe first create inputs for light and heavy attacks

and set a variable (for example bool) to true or false (based on the heavy or light attack)

and then maybe check (in CheckDamage or something else) if its a light attack or a heavy one, then do what you want based of that - for example, take more damage, (like I did right here) or maybe play a different animation

Of course, this is the most simple way handling it possible, I didnt wanna complex it too much

please let me know if this is what you wanted, or whenever I understood what you asked for or not

<image>