OK, so here is what you have.
The Line is in the box with the receptacle. It’s the black jumpered from the Inovelli next to it. The Line is presently connected to the common terminal on the dumb switch. So the switched hot is routed to the other box over the red and black travelers on the 3-wire. At the other box, the two travelers connect to the dimmer and the switched/dimmed hot is returned over the white of the 3-wire.
If I am correct, in the box with the receptacle, if you separate the white/black with the blue wire nut and touch the black conductor to the black screw on the presently existing dumb switch, your lights will go on. Please confirm.
So what you have, pending your confirmation, is a Line and Load in the box with the receptacle. The Inovelli will go there.
In the receptacle box, the jumper to the black screw on the dumb switch goes to the Line on the Inovelli. Jumper a white pigtail to the neutral on the Inovelli. That red wire nut is pretty fat, so use the open backstab on the next switch over. The black from the 2-wire going to the light (presuming you confirmed that) gets wire nutted to the black from the 3-wire. The red and white from the 3-wire get connected to the Load and Traveler terminals on the Inovelli, white to Load and red to Traveler.
In the other box, take the dumb switch you just removed and put it there using all three wires from the 3-wire. Black to the black screw and red and white to the brass screws.
The switch settings you displayed in the Hubitat screenshot are correct, but confirm them.