Set layout in routes

Hello

Kapa told me about a legendary appLayout in the nuxt.config.ts but it doesn't seem to exist

    routeRules: {
        '/admin/**': { ssr: false, appLayout: 'admin' },
    }

    routeRules: {
        '/admin/**': { ssr: false, appLayout: 'admin' },
    }

Is there a way without using a middleware to set up a layout for a specific routes ?

Thanks

Set layout in routes - Nuxt