Ok, thanks. Here is what I think will work.
I’m presuming that power is being fed from the house side. You’re going to have to have the Aux in the house and the Inovelli Switch in the garage. The reason for this is that when you have a power feed to the Aux first, you actually send the line and neutral over to the Inovelli via the black and white of the 3-wire. Since the Inovelli is in the garage, this gives you the added benefit of having a hot and neutral in the garage. The signaling between the Inovelli and the Aux takes place over the red.
So now in the garage, grab the constant hot and neutral and send it to a receptacle for the chargers, or send it to half of a split receptacle. The other receptacle for the lights, or the other half of the split receptacle gets the switched line from the Inovelli.
Make sense?