Help redirecting a specific page from a domain to a different domain page

Hello! I just added a temporary redirect (without path forwarding) which works for the TLD > new domain w/slug. But the other slugs are not forwarding and I don't see a place to add a rule for a slug to redirect to another domain's page. This is the most important one for commerce, so I need some solutions. Any ideas? Thank you!

Additional desired redirect: 
spaceon.land/book > modernnature.org/space

Existing redirect: 
spaceon.land > modernnature.org/space