Hedley Wright provides a short tutorial on using the Frames app to add EXIF data to your scanned film photos for importing into apps like Adobe Lightroom:
For many film photographers, this bridges the gap between analogue shooting and digital organization. In this article, we’ll explore how that information is transferred to your scanned images as EXIF data—and how you can use it to search and organise your work in Adobe Lightroom.
Frames is a well considered app (on iOS and macOS) by Vincent Tantardini.
As an aside: I recently used Claude Cowork to add EXIF data to my film negative scans and it worked just fine. But using Frames would be much more precise and easily repeatable.