Help with custom shutter card (Deejayfool) needed

Hi,

i am relatively new to Home Assistant and want to use the shutter card from Deejayfool.
My shutters are connected via MQTT and they need only the number in percent.

I think I can use the partial_close_percentage from the shutter card, but I don`t know how to get that, and / or trigger on change of the shutter.

I hope you can help me.

Greetings
Markus