Hey, not too long ago I bought a Nokia 5.4, and don’t see it supported anywhere. Any possibility to see it supported here?
Regain your privacy! Adopt /e/ the unGoogled mobile OS and online services
According to this post on XDA Forums
The Nokia 5.4 cannot be bootloader unlocked as of today.
If you can’t unlock the bootloader, then you can’t install a custom ROM whether it’s /e/, LIneage OS or anything else. So unfortunately the answer to your question appears to be “No.” 