VueRouter (Nuxt) keep alias path when navigate to children

Question

I defined in my router some aliases, and I would like to use push while keeping the path

example

I've a route which has the path /test/a which has the name route-test with aliases ["test/b", "test/c"]

And i have child route in this route without alias

how can i use $router.push specifying the alias to be used for child route ?

Thanks for help

(Nuxt2, VueRouter3)