Chirpstack and Thingsboard integration

Hello to the entire forum community.

I am currently working with the Chirpstack-Thingsboard integration which is configured by the integration option available in the Chirpstack application menu; the integration works great for uploading data from a device; however I need the reverse process; that from a thingsboard button a signal is sent to Chirpstack and then it is sent to a device to control digital outputs. Can you guide me please how to do this integration in the documentation I see that some APIs are exposed but I do not know where to start.

Thank you very much for your attention and help with this concern.