Enable/Disable Touchpad with Keyboard Shortcut

Also posted this on Reddit, but doing so as well here for visibility, and also because I like Lemmy and want to see more activity here! :D

Hey there. I'm new to sway, and so far things have been working very well for me. But I can't seem to find exactly how to set a keyboard binding that modifies an input. I know how to set up my inputs and custom bindings. But can't figure out how to put the two together.

Anyone have some advice on how to remap my Fn+F1 binding to toggle the touchpad?