He does have a power to the light situation, but it’s not that diagram. So that solution won’t work.
@dc77 has a single 3-wire to each box. That means that power is to the light, but there is no Romex connection between the boxes. Instead, there is one 3-wire from the light box to each switch but nothing between the switches. From what @dc77 described, this diagram is correct:
There is a way to wire this, but unfortunately, it involves re-wiring at the light. From the light box, you have to send power and a neutral to one switch were the Inovelli will go. From the light box you also have to send power and one traveler coming from the Inovelli to the other box where the Aux will go.