The solution in accepted answer here works on Nougat 7.1.2 using Gboard
What do I say to make a new line when using voice recognition?
But irritatingly, microphone switches off when you move to new line or paragraph and you need to activate it again, breaking the dictation and thought flow
How to prevent that on Nougat 7.1.2 ( not rooted)?
Please don't suggest any apps