Informacam has a similar “chain of custody” goal but was developed for existing devices. Guardian Project was involved with CameraV, the android version for mobile devices. It looks like Proofmode is now the active project & it’s available for ios as well as android. https://proofmode.org/
After reading the “issues” discussion from w weeks ago, this is just an idea at this point. The simplemobiletools fork was a mock up for something that sounds like its very much in the planning/ideas stage. you can also go to fossify.org to see another mock up that does nothing right now. You could message one of them, but I think maybe its some MIT software team / group & their just tossing ideas around for a foss hub of sorts.