Question about Editor Theme with EditorWindow

Good evening,

I am working on a tool to be published on the asset store and I wondered if there was a way to preview what my tool would give with the black theme (that of the pro version). I am in a personal version, I do not want the complete theme but just my window (EditorWindow) to see if it will be good for everyone.

Regards,
Mr Nazarick

There is no way then? I keep looking but I can not find. Thank you in advance if you can inform me.

You can get unity plus, it allows for the dark theme. Or you could just have some test it for you.