Implementing unknown routes in nuxtjs?

Question

JavaScript

Let's say I have an application on nuxt.js and there are only 2 files in pages. index and about. Accordingly, they will be available at the addresses / and /about.
In the admin panel, it is possible to create pages, among other things, specifying the address at which the page will be available.
For example, you can create a page with the address contacts. such pages are stored in the database.
The problem is that when nuxt receives the /contacts address, it first checks if there is such a page in pages, and then, if it is not there, it launches a component that would pull the content from the database through the api. It can be simpler: do not check in pages, but just check if the received address is in the array ['index', 'about']
Maybe someone knows how to carry out such a check and connect another component? How is this generally implemented?
Thanks