The Mentionables plugin lets you establish a custom mention dataset. Custom mentions work the same as @users or #categories, but use data external to discourse, including linking to external urls. Try it out on try.thepavilion.io by opening a composer and typing
Currently google sheets is the only supported data source, however the plugin is designed to support any source. If you’d like to add a new source, please contact us.
Not sure how to install a plugin? Follow the steps here.