Heating scheduler GUI

I would like to create heating scheduler GUI (similar to Netamo : https://my.netatmo.com/app/energy?demomode=true) for Home Assistant but I don’t know to do.
I think I need to create a custom card in lovelace and generate html code for the design but I don’t know how to link them.
Could someone explain me the procedure and/or share me a template?

Did you already check out the simple scheduler add-on

Thank you because I have not seen it before but now, I read read all the discussions on it.
I have not tested the add-on but if I well understand, there is non visual week scheduler like Netamo.
I would like to create a visual week scheduler but unfortunately, I don’t know how to do this but I would like to learn.