I hope that Dorico would support bend notation for the notation staff and not only in tablature because it would be easier to read than in the current version of Dorico.
Huh… 
You didn’t ask for my opinion, of course, but I don’t like this idea, unfortunately. 
But then again, I don’t have to… but here is my reasoning:
Notation should ideally reflect sound and pitch that is audibly reproduced by playing the instrument. In this case, the middle, bent note does not show this.
I personally do not use TAB at all for my own playing, but have to use it in dealing with students.
Best I found so far is this from HL, treating bending as a form of legato:
Just my 2 cents…
B.