How to generate many icons of the same type?

Question

JavaScript

Hello Toaster!
In my spare time, I develop an alternate version of my favorite sharaga schedule.
Tyk, vidasik
Tyk, touch (in the literal sense, you need a touchscreen)
Ultimately, all this should result in PWA. I have already dealt with dynamic manifests, it remains to generate a bunch of icons of different sizes for each group (white background, group number - that's all).
Question: how to do it most painlessly.

Answer 1

What's stopping you from creating a picture? Insert a canvas and draw on it, or generate an svg, or draw on an invisible canvas and get a picture as data-url, and paste it where necessary, or do without pictures by setting a block with the desired text, a white background.