[Feature Request] Adding more customization of help window for each layer individually

Hi, first of all, this plugin is really great because it keeps minimal while allowing even multiple layers overlay on each other.
Especially comparing to similar plugins like hydra.nvim and submodes.nvim.

Currently I find I coudn't control the size of help window individually, so I create this issue

Ps: can this repo have a discussion session since the plugin really have great potential.