How to set up a reverse proxy on nginx so that the prefix is ​​automatically substituted?

Question

Nginx

I have 2 services that I want to connect to via a reverse proxy:
https://mydomain.org/service1
https://mydomain.org/service2

If I set proxy_pass to location "/" when logging in, the service returns the .../sign page , which is substituted for the URI. Those. returns https://mydomain.org/sign service opens. If I set location "/service1" and try to log in via https://mydomain.org/service1 , I get to https://mydomain.org/sign - an empty page, while manually typing https://mydomain.org/ service1/sign then the service authorization page will open
how to configure nginx so that the /service1 prefix is ​​substituted by itself

My nginx config

user nginx;
worker_processes    auto;
events { worker_connections 1024; }
http {
    server {
        listen 80 default_server;
        server_name mydomain.org;
        return 301 https://mydomain.org$request_uri;
    }
    server {
        server_tokens off;
        listen 443 ssl;
        server_name mydomain.org;
        ssl_certificate /etc/nginx/certs/fullchain.pem;
        ssl_certificate_key /etc/nginx/certs/privkey.pem;
        ssl_prefer_server_ciphers on;
        root    /usr/share/nginx/html;
        include /etc/nginx/mime.types;
        proxy_buffering  on;
        proxy_buffer_size 8k;
        proxy_buffers 8 8k;
        location / {
            try_files $uri $uri/ /index.html;
        }
        location /service1 {
                proxy_set_header Host $host;
        	proxy_set_header X-Real-IP $remote_addr;
                proxy_pass https://192.168.0.1/;
        }
        location /service2 {
                proxy_set_header Host $host;
        	proxy_set_header X-Real-IP $remote_addr;
                proxy_pass https://192.168.0.2/;
        }
        gzip            on;
        gzip_vary       on;
        gzip_http_version  1.0;
        gzip_comp_level 5;
        gzip_types
                        application/atom+xml
                        application/javascript
                        application/json
                        application/rss+xml
                        application/vnd.ms-fontobject
                        application/x-font-ttf
                        application/x-web-app-manifest+json
                        application/xhtml+xml
                        application/xml
                        font/opentype
                        image/svg+xml
                        image/x-icon
                        text/css
                        text/plain
                        text/x-component;
        gzip_proxied    no-cache no-store private expired auth;
        gzip_min_length 256;
        gunzip          on;
    }
}