Frontend, Backend and Admin. Symfony and Yii2 in subdirectory

nginx.conf

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    set $root_path /var/www;
    root $root_path;

    server_name domain.com;
    error_log /var/log/nginx/domain.com-errors.log;
    access_log /var/log/nginx/domain.com-access.log;

    location / {
        root  $root_path/frontend/dist;
        try_files $uri /index.html /frontend/dist/index.php$is_args$args;
    }

    location /api {
        root  $root_path/backend/web;
        rewrite ^/api/(.*)$ /$1 break;
        try_files $uri @backend;
    }

    location /admin {
        root  $root_path/admin/web;
        rewrite ^/admin/(.*)$ /$1 break;
        try_files $uri @admin;
    }

    location @admin {
        fastcgi_pass unix:/run/php/php7.3-fpm.sock;
        include snippets/fastcgi-php.conf;

        fastcgi_param SCRIPT_FILENAME $root_path/admin/web/index.php;
        fastcgi_param SCRIPT_NAME /admin/index.php;
        fastcgi_param REQUEST_URI /admin$uri?$args;
    }

    location @backend {
        fastcgi_pass unix:/run/php/php7.3-fpm.sock;
        include snippets/fastcgi-php.conf;

        fastcgi_param SCRIPT_FILENAME $root_path/backend/web/index.php;
        fastcgi_param SCRIPT_NAME /api/index.php;
        fastcgi_param REQUEST_URI /api$uri?$args;
    }
}