Issues when trying to access Runtime Config using DynamicRoutes

[enrico-bagattin]

Hello, thank you for this great package!
I have followed the guide for dynamic routes, but when I am trying to access to the runtime config in sitemap_routes.ts I got this error:

ℹ Generating sitemaps

 ERROR  nuxt instance unavailable

  at useNuxtApp (node_modules/nuxt/dist/app/nuxt.mjs:130:13)
  at useRuntimeConfig (node_modules/nuxt/dist/app/nuxt.mjs:137:10)

If I place the API Key directly in the code it works well.