The solution I use for this problem is a vs code excalidraw plugin that saves the drawing inside the png rendering of it.

So you include the image into your markdown or code comments and can then edit it in a vscode window.

Another one I used for a while is asciiflow.com or the monodraw mac app

https://marketplace.visualstudio.com/items?itemName=pomdtr.e... (I didn’t make it, just a happy user)