Redirect Single page to http

Website is currently loading in https by adding the following rule in .htaccess file:

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Would like to redirect 1 particular page /app, to load in http only, and rest of the pages via https. Please check the chat transcript for more info.