I want to apply a Templater markdown file hotkey autmatically to all files in a folder

Things I have tried

Don’t know where to start, other than reading Templater plugin documentation. Was able to set up a hotkey for a particular Templater template markdown file, but was only able to apply it one file at a time.

What I’m trying to do

I want to highlight a folder in the file explorer, press a hotkey to execute a Templater template markdown file, but have this particular template file operate on all files below the given folder in the hierarchy. Alternatively, create a new hotkey to have a Templater template markdown file with another hotkey operate on all files in a folder. In other words, in general, have hotkeys operate on all files in a folder hierarchy by calling other hotkeys.