Host Blazor app under subpath, possible?

I have a Blazor app which is served by nginx. How is it possible to host it along with other apps on nginx like:

https://www.site.com/phpsite
https://www.site.com/aspnetapp
http://www.site.com/blazorapp1 
http://www.site.com/blazorapp2

I can access my dotnet apps via port directly (this is working):

https://www.site.com:4320/
https://www.site.com:4321/
https://www.site.com:4322/

When i am using url rewrite in nginx the files don’t get loaded but the index.html.

  location / {
      rewrite /blazorapp1(.*) /$1 break;
      proxy_set_header   X-Real-IP $remote_addr;
      proxy_set_header   X-Forwarded-For $remote_addr;
      proxy_set_header   Host      $http_host;
      proxy_pass         https://www.site.com:4321;
  }