Dynamic nested path
[issue link]How to be in this situation?

Conditions:
- params _lang and _alias dynamic
- link pages/_alias.vue to pages/_lang/_alias.vue…
~My solutions (did not work):~
~1. redirect to next route… beforeEnter (to, from, next) => {}~
~2. merge files: pages/_lang/index.vue and pages/_lang/_alias.vue~
~3. set page validate params (only render page 404, no reroute)~
~4. no priority at route (no function)~
…