I've been doing this as part of my workflow for a few years now. My coworkers have expressed appreciation around that effort.
A nice side effect is that going through a self review and adding comments to the PR has helped me catch innumerable things that my coworkers never had to call me on.
Do you see any added value in adding the comments? I just fix the original commits and force push (each dev owns their branches at $JOB), but I'm wondering if I'm missing something?
The value I get is that it helps me catch errors before I ask others to check my work, and I use my PR comments as a teaching tool (I'm one of the seniors on the team).