Can I Fix Photo Dates on a Chromebook?
Chromebooks are awkward for this. Here are the realistic options, including the one most people end up using.
ChromeOS does not run normal Windows or Mac programs. That rules out most photo tools straight away. Web-based fixers exist, but they mean uploading your family photos to a stranger's server, and a large export will take a very long time.
Some Chromebooks can run Linux apps through the built-in Linux container. If yours supports it, you can install Linux software and work locally. It is a setting in ChromeOS, not a hack.
Takeout JSON Metadata Fixer has a Linux build that works this way, and Windows and Mac builds if you have access to another machine. Everything runs locally, so nothing is uploaded. Free for your first 500 photos.