DJI Fly doesn’t support waypoints, but have a look here @Vennwood
Litchi chit-chat ... What's Litchi? Should I use Litchi?
The Mavic Air 2 isn’t supported by Litchi yet but if DJI ever release a SDK for the Air 2 then Litchi will be all over it in a matter of weeks.
If it helps, the SDK for the original Air followed about six months after the drone was launched and Litchi had it supported in beta about a fortnight later.