Key fob is it compatible to find my apple app

No. no key fobs from any car maker are compatible with find my app.

In the near future, some cars themselves will support the keyless entry with an iPhone. But its the car that needs to support the feature, not the actual key fob. The key fobs themselves have to my knowledge no tracking option.

See here: link-> https://www.macrumors.com/guide/carkey/

You can attach an Apple Air tag to the fob however and track that. https://www.apple.com/airtag/