I’m going to provide some background here…
Speaking conceptually- any electrical device needs two wires to form a circuit. Power flows in on one (hot) and out on the other (neutral). The power flowing through the thing is what makes it work- supplying power isn’t enough if it doesn’t have somewhere to flow to.
To make a sink analogy, hot wire is the tap plumbing, and neutral wire is the drain. All the neutrals in your house are connected together in your electrical panel (as all the drains connect at the sewer) but the faucet piping is controlled by valves (just as the hot lines are by circuit breakers and switches).
In a normal dumb switch wiring is easy- all you have to do is interrupt the ‘hot’ flow to the bulb and the light goes off.
Smart switches are harder because now there are two devices that need a power flow- the light, and the switch itself. That’s why smart switches need a neutral wire. Inovelli’s dimmers can work without neutral by using the light itself as the neutral- the tiny power used by the Z-Wave chip isn’t enough to illuminate the light; but the light must allow enough power to flow through it to make the Z-Wave chip work.
Think of it like two sinks where the drain of one sink flows into the faucet of the second sink.
So if you have a wiring box without neutral, where you ALSO won’t have a load for the dimmer (the light fixture must always be on), then you have a situation where there is no neutral / drain for the power used by the Inovelli switch you put in there.
Now your electrical box is a conundrum. In general, black wires are almost always ‘hot’, and white wires are almost always neutral. There’s almost no situation where you’d want hot and neutral tied together, as that would be a short circuit (think sparking and buzzing and instantly popped circuit breakers).
I’d suggest for your box you should figure out where each of those wires go before you try to install anything new…