There is ASCOM driver on github (https://github.com/T0T4R4/astrohaven-dome-ascom) which does not have an .exe file to install it so you must compile it and create an installation program. I was able to do this but it did not work on our legacy dome. It might work with a newer dome. Instead, with the help of AI, I wrote python scripts which allow us to open and close the dome half at a time. We run these outside of NINA but I think they can be executed within NINA if needed.
Better news is that Foster Systems wrote an ASCOM driver for it which the previous owner discovered they still had and are sending it to us. I am not sure what extras it offers but it was used on our dome so it might be an improvement from the python scripts. The Foster website shows it for sale for over $200 but the link was dead and I did not pursue it further.
I will post again after we try the Foster driver.