If this is already possible, please provide me with information on how to use them.
What I'm looking at is a way to have custom variables that could have set values and be editable in the Commands tab (in a new subtab on the left). Some streamers may have multiple commands that return some of the same information and that information may change from time to time. For example, a streamer could have !youtube, !social and !playlist commands that all contain a link to their YouTube profile but they may make a new YouTube channel/account/etc and then suddenly they have three commands to edit. However, if they were to have a custom variable that they named "youtube" they could instead use something like @custom_youtube@ and just edit it in one place. Then all the commands would provide the correct information the next time they're used.
The reason for making it @custom_(name)@ is the prevent possible conflicts with existing variable names.
At the same time, unless it's already available and I just didn't know about it, would it be possible to add in @subcount@ and possibly a couple of other items that are up to the streamer to either disclose or not? Some streamers like to keep their sub count private and that's understandable, but some streamers don't mind sharing it or other information that is only available to the streamer (that the DeepBot can pull via API).