We had something kind of similar, but designed to avoid merge contention. We had each PR include a randomly-generated number, and a `changelogs/` folder where y

We had something kind of similar, but designed to avoid merge contention. We had each PR include a randomly-generated number, and a `changelogs/` folder where you could add a `${number}.md` that was either blank or had a message that would be added to the changelog. After you made the PR, you could run a bash script to edit the PR to contain the number and generate the `${number}.md` file. It felt kind of silly and I don't know if anyone actually looked at the changelogs, but it took 2 minutes out of my day and worked well.