How to make a route with a complex condition?

Question

Vue.js

Good afternoon. The point is this.
There is an example, which is a child of the blog route.

/news/2020/123-novost

Consisting of 3 parameters:
:news(string)/:year(int)/:post(string)

How to write path in vue-router so that:
news is optional. If it is not there, then the others do not make sense.
year - optional. But can only exist when there is a news
post - optional, but only exists when there are two previous ones.

Help solve the puzzle.
There is an idea to make them children to each other, well, they say
blog
- news
- - year (news parent)
- - - post (year parent)

But will it work?