Not being able to use my Focus settings over devices is a pain. I’m not going to export/import every time a make a change.
Best solution would be that Mojeek would add user accounts in which those settings are stored and synced, but I can imagine that’s not easy to do.
What I would suggest is to allow setting a URL, instead of entering the Json, that points to a Json file that contains my Focus settings. I could then host that Json on my own server/hosting and thus create my own “sync” solution.