Apache to nginx subfolder rewrite for ckeditor - apache

Question

I am using Laravel forge for provisioning webservers and works great right out of the box.
I now encounter the following customer question that I can't seem to manage solve.
In the folder of /file/ckeditor/php/ there is a .htaccess with the following contents.
RewriteCond %{REQUEST_URI} !^/file/ckeditor/php/file(/.*)?$ [NC]
RewriteRule .+ index.php [L]
So basically the request of /file/ckeditor/php/link should rewrite to /file/ckeditor/php/index.php.
The rewrite rule must be skipped when there is no /file/* in the end. I have a current nginx configuration of the following, but maybe I need to set a new document root and a new php handler?
root /home/forge/faked-domain.nl/public;
index index.html index.htm /lib/blue2.php;
location ~* \.(?:jpg|jpeg|webp|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
expires 1y;
access_log off;
add_header Cache-Control "public";
}
location / {
try_files $uri $uri/ /lib/blue2.php?$query_string;
}
location = /favicon.ico { access_log off; log_not_found off; }
location = /robots.txt { access_log off; log_not_found off; }
access_log off;
error_log /var/log/nginx/faked-domain.nl-error.log error;
location ~* \.(?:jpg|jpeg|gif|png|ico|cur|gz|svg|svgz|mp4|ogg|ogv|webm|htc)$ {
expires 1y;
access_log off;
add_header Cache-Control "public";
}
error_page 404 /lib/blue2.php;
location ~ \.php$ {
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
fastcgi_index /lib/blue2.php;
include fastcgi_params;
}
Hope someone can help me out..