Their FAQ here lists some answers:
https://bonaire.klm.com/en/informati...rport-on-board
The big ones are:
- All passengers travelling from, to or via Schiphol Airport are required by the Dutch government to fill out a health declaration. You will fill out this declaration automatically during check-in and you don’t need to bring a paper copy of the health declaration.
- You must meet documentation, entry, and testing requirements of your destination from AMS