Angular app nginx config, handle aws load balancer base path

I'm trying to get an angular container running behind an AWS load balancer. The load balancer serves other apps based on routes eg. elb.amazonaws.com/some-path

I started with this nginx.conf which works when accessing the container directly, but not behind the LB due to the /some-path that's also passed to the app.

server {
    listen       80;
    listen  [::]:80;
    server_name  localhost;
    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
        try_files $uri$args $uri$args/ $uri $uri/ /index.html =404;
    }
}

I tried updated location / to location /some-path/ The first request to the app returns index.html correctly, but the subsequent calls fail as the base path disappears and is hitting nothing on the LB e.g. RequestUrl: elb.amazonaws.com/runtime.js instead of elb.amazonaws.com/some-path/runtime.js I noted below on the request headers it has the Referer correctly Referer: elb.amazonaws.com/some-path/

I've tried to add different combinations of /some-path/ in location and try_files, and some other config in the app, but to no avail. The only way I managed to get this working was to copy the app into a sub directory /usr/share/nginx/html/some-path and set that in try_files

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
        try_files $uri$args $uri$args/ $uri $uri/ /some-path/index.html =404;
    }

Then add it to index.html <base href="/some-path/">

Is there another way to handle this,(e.g. .net apis fix this with app.UsePathBase) without having to move the app to a subdirectory dictated by it's LB path?

Many thanks.