On one hand, this could provide a lot of value as some things are just plain hard to explain using only words. On the other hand, aren't you worried about when someone else comes along and needs to update one of those comments? If they're not aware of this tool, it's either going to be incredibly tedious or simply not going to happen.
As the other commenters put it, i dont think this is a huge issue.
I usually use this for architecture level diagrams, and that shouldn't change often/at-all. In-case it does change, doing a new diagram is perfectly in-scope of whoevers working on that.
It's an issue I'm seeing even for comments touching too much on algorithmic stuff. To take a somewhat common example, if you were dealing with a credit card payment flow, where would the explanation of how a transaction goes through a few states asynchronously, which all trigger a webhook callback ?
Obviously the people working on the code need to be aware of that, so documentation is somewhere needed. I've seen people put whole blocks in class headers, other sprinkle it all inside the code, personally I ended up moving it outside of the code. Where would you put it?