Custom headers for Reverse Proxy in netlify.toml

Hello,

I have a commercial website running on Netlify (https://beelit.com as a test environment)

My blog is running on a hosted Wordpress platform called Kinsta.
The blog is available through blog.beelit.com, but I would like to set up a reverse proxy to make the blog available at beelit.com/blog/

I have already contacted Kinsta to set up the reverse proxy on their side, which seems to be done.
Still, these configuration usually require some set up on the main domain server.

On nginx it would be something like this:

location ^~ /blog/ {
proxy_pass https://blog.beelit.com;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_ssl_name $proxy_host ;
proxy_ssl_server_name on;
}

How could I replicate such a configuration using the netlify.toml?

Based on your comment in the helpdesk, this appears to be resolved.