If Bluetooth Then Hotspot

I have a Pixel 2 and I just installed a Android head unit in my car. I am looking for an app or script that when I get into my car and my Pixel connects by bluetooth to my head unit it turns my Hotspot on so my head unit can get internet connection. I tried IFTTT but that doesn't have an option for it. I am new to Android a bit but pretty computer savvy. Has anyone seen an IFTTT like this or know of how this can be done?