Rspamd allows to modify its configs in web-ui, if you don't like to manage its settings in web-ui, then you could use a terminal session (ssh for example) and modify the files from a disk. If you don't want to modify files for every new server, then you might write a script for it. If you don't know how to write scripts, you might get someone to do it for you.
If you're asking something else different, then clarify please.
If you're asking something else different, then clarify please.