I'm trying to pull a custom report in Google Analytics with custom-made segments as a dimension of the report. I don't see custom segments available in the list of dimensions. I can slice the pre-built GA views by custom segment as I want, but can't seem to add them to add them to a custom report or the api. Custom dimensions appear to be available as dimensions in custom reporting, but I do not have the ability to add new dimensions to the GA tag on the site.
Does anyone know if custom segments are available to pull into as dimensions of a custom report in Google Analytics or 360?