If you’re proud of the work, I’d explicitly name PRs that you made. I’ve been in a hiring position, and I eat that shit up. Especially if it’s close to our tech stack.
WRT keeping personal/work separate: most of the places I’ve worked have explicit clauses in the contract saying they own everything I produce. I need to get explicit exemptions for hobby projects that I publish. In all cases they’ve been granted pro forma. But, if you want to follow the letter of your contract, you’ll be telling HR about that anyway.