Nginx: Same root folder for multiple website different robots.txt

Hello,

I have a first website with this configuration:

server {
        server_name mywebsite.com;

        root /var/www/website/prod;
...
}

and a second one like this with the same root folder:

server {
        server_name pro.mywebsite.com;

        root /var/www/website/prod;
...
}

And the only problem is they have the same robots.txt file.

Is it possible to tell the second server to link the file robots.txt to another file like robots-pro.txt?

And by the way the url http://pro.mywebsite.com/robots.txt would open the file robots-pro.txt.

Thanks, Vincent.