Use Nginx to run WordPress and Node.js

I have installed the LEMP stack with this guide and have installed wordpress with this guide. They were both great guides but I need help making a small change.

I want for the root route to reverse proxy into a Node.js server. I would then like the /blog route to serve the wordpress site. As it stands right now the root route servers the wordpress site perfectly.

/etc/nginx/sites-enabled/default

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

    root /var/www/html;

    index index.php index.html index.htm index.nginx-debian.html;

    server_name my_ip;

    location = /favicon.ico { log_not_found off; access_log off; }
    location = /robots.txt { log_not_found off; access_log off; allow all; }
    location ~* \.(css|gif|ico|jpeg|jpg|js|png)$ {
        expires max;
        log_not_found off;
    }

    location / {
        try_files $uri $uri/ /index.php$is_args$args;
    }

    location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    }

    location ~ /\.ht {
        deny all;
    }
}

How would I modify this Nginx config so that /blog is wordpress and all other routes are handled by a Node.js server?