Honestly, not that I know of. It is an issue since I know mods need to add commands through chat since they don't have access to the bot itself. It has been suggested to have an emulator for mods, but also a dash board to make it a bit easier for mods as well. But right now, I don't know how to go about it. You would most likely just need to give the streamer the info for the command to make it.
If you have Deepbot yourself, you can always make the command, then export it and give him/her the code to import it.