So! How can I add then a noopener but with a dofollow tag?
Enable the No follow checkbox:
That give you a nofollow link! Wanna have a dofollow 
Doesn’t it do that by default if you simply open in a new tab without selecting no follow?
It blocs doesn’t add the dofollow tag. I think acording to the forums on google the noopener tag should be added without the nofollow to count as a backlink
I thought it would follow by default, unless told not to.
I think it was that way on blocs 3, dont remember cause I was always clicking and unclicking the no follow to get the noopener tag but checking the code on blocs 4 it only export noopener nofollow and when you unclick there it no tag.
Whoops, totally misread that 
When I check the code in preview, not ticking the checkbox adds nothing to the a tag. Checking it adds noopener, nofollow and noreferrer to it.
Maybe @Norm can share his thoughts on this and provide insights, especially about the mentioned backlink issue or the possibility of offering more options in the future?
Exactly! That was what I was trying to say! It wasn’t like this on blocs 3 I think! I need to check!