How do I enter my COVID vaccination card to my apple Health app

How to add a boarding pass, ticket, or other pass to Apple Wallet on your iPhone

1. Open the app, email, notification, or other communication that contains your boarding pass, ticket, or other pass.
2. Tap Add to Apple Wallet.
3. Follow the instructions on the screen.
4. If necessary, tap Add in the upper right corner.

Also read this:

https://support.apple.com/en-us/HT204003