Would like to be able to add a guest user to multiple projects, easily. Right now, I have to open each project and invite them through the "People" tab. It is possible to REMOVE users from projects fairly easily (in the settings > guests tab) but not the other way around.

This is needed because we have a team guest account that submits feedback other guests can see. See https://marker-io.canny.io/feature-request/p/guest-can-see-all-feedback