Structure entry position in url Is it possible to include the entry position (Structure) via the Entry Type Title Format?

This is the current format:

published in {postDate|date('F')} {postDate|date('Y')}


which renders: published-in-april-2018

This is what we need it to render:

number-3-published-in-april-2018


I could create an actual Number field called “numberTitle”, attach it to the Entry Type, and set the Entry Type’s title to be dynamically generated using the template “{numberTitle}”, but why does this need to be done manually?
You would think that the entries in a Section have a natural order in sequence or maybe they don't?

If the EntryVersion Model cannot deliver could Twig offer a solution?
You can include the level 

number {level} published in {postDate|date('F')} {postDate|date('Y')}