Is then an option not to delete the blueprint after force wipe
save a file? or install a plugin? or is not possible?

Depends on how you wipe the server and what host do you use (because they might have a panel/buttons/etc for "easy" wipe that erases everything)... Rust forced wipes only clear map 99% of the time and very rare the blueprints like 1 time per year. So I wipe manually my server and blueprints are never wiped unless I decide to do it. I do update the server, update oxide and just change seed numbers then blueprints stay the same. If for some reason they are wiped for you, try to make a backup of "player.blueprints.4.db" that's located inside server/YourServerIdentity/player.blueprints.4.db

so force wipe does not delete blueprint? but I should take care of player.blueprints.4.db?

Yeah forced wipe do not delete them so you do not have to do anything at all and they should stay untouched. I said you can tale care if your host have auto wipe buttons etc... but again you should be able to select only map wipe.