The fonts will be symlinked to your ~/.fonts folder from their original location—so you can organize your font collection however you please. FontyPython is free and open source, for Linux only.

A set of Python utilities for extracting glyphs from TrueType fonts and replacing them with custom SVG's. - Cullenbotha/font-glyph-tools ...

As per my needs , I created Python CLI Script using docker , to Auto Detect Fonts used/mention in .html templates (scan "templates" dir with .html extensions), then extract all html files content then ...