Hello,
i've created a very small and easy integration for SemaphoreUI just to be able to see inside HA if the last execution of my templates was successful or not ( GitHub - MassiPi/Home-Assistant-Semaphore-UI-integration: Home Assistant Integration for Semaphore UI - for HACS · GitHub )
Most of all, this was my first config_flow experiment 
Btw, it strangely works, but i'd also be interested to know when the esposed status (success or problem) was generated. I obviously have the datetime of the last run of the template, but can i link it to the binary sensor? or creating a new specific sensor is the only way?
Thanks