Unfortunately, no.
Since Website Pro is managed by WordPress hosting, customization of server directives for the site in Website Pro is not supported. Also, Website Pro is built using NGINX, therefore .htaccess files (which are an apache directive) will not work or have any effect.
In summary, any server-side modifications causing server-wide changes would not be supported.
If you would like to know more about NGINX or Apache, here is an article for more information.