Campaign and Documents - "one to many" or "many to many" relationship

Could you help or advise if it’s possible for Campaigns and Documents to create one to many" or “many to many” relationship? I don’t have knowledge in coding, so I would like to do this using the Studio only. The idea is I want the Campaign screen to have the Documents module so I can relate multiple documents in a Campaign record. Is this possible in the Studio?

I tried creating relationship for Campaign but only the option “one to one” is available. Please please help! Thanks!

Have you found the solution?