Not a tesla flow, but I do have a flow that does that for my Amina Charger.
Just replace the Amina specific cards by Tesla cards and my youless P1 cards with your homewizzard P1 and you should be there…
There is a link to download the flow too.
Works like a charm!
As soon as the surplus power on my P1 (not homewizzard, but its all the same) is over 6A (my car does not allow 5A) it starts charging driving the surplus to zero. Adjustment is per 1A. I use the median over 1min but you can also change that to your liking)
