Kanata is amazing ! i'm using it right now. it can do many things like making a key a dual-function key (a letter on tap, a modifier on hold) and so much more
it recently got a new chording feature where you can press a whole bunch of keys at once (or just two if you'd like) and something will happen. like, you could press the letters q and n at the same time and program Kanata to send the word question or some macro like a hotkey or a series of hotkeys and strings. it's all up to you. i have a QMK board, but because Kanata has many more features and isn't limited to the memory of its chip, i use Kanata instead of QMK to architect my layout, complete with multiple layers and many QoL niceties