Set X-Robots-Tag in ispconfig custom nginx settings

Hello

My goals is to be able to set X-robot-Tags based on the content of the url. My current setup is like this
Internet <--> Nginx Proxy Manager(docker) <--> ISPconfig (based on Nginx)

One of my sites is a (troubled) woocommerce site.

Whenever an url is accessed wich has add-to-cart in it i want it to add the X-Robots-Tag "noindex"(perhaps others in the future)

What i have tried:
In Nginx Proxy Manager:

Code:

location ~*^(/.*)/add-to-cart(/.*)?$ {
    add_header X-Robots-Tag  "noindex";
    try_files $uri $uri/ /index.php?$args;
}

I also tried variations of

location ~* add-to-cart {
    add_header X-Robots-Tag  "noindex";
    try_files $uri $uri/ /index.php?$args;
}

Furthermore i tried using a map like this

Code:

map $uri $robots_tag {
    ~*^/add-to-cart(/.*)?$  "noindex";
     default "";
}

and then add to the / location

add_header X-Robots-Tag $robots_tag always;

Did not work, i tried the same on ISPconfig level with similair results

As far as i know none of the NGINX instances activly removes X-Robot-Tags, so once set correctly they are bound to stay visible

Is there a way i can reach my goals using custom nginx settings in ISPconfig?

Thank you in advance for your insights