It took a month but I finally finished my MVP! It's very basic right now but solves the core of the problem I want to address. The chrome extension takes a screenshot and opens the pilot feedback editor where designers or other stakeholders can leave feedback.
I spent part of the last week of coding the MVP reaching out via cold messages to designers and front end devs on LinkedIn. So far, I have enough data to know that the process teams follow for feedback is the same as my experience. I hope to onboard a few people I talked to very soon.