Use URL Parameters in Twig Anything SQL Query

My goal is to output WordPress pages and posts in a specific XML format. I have installed the Twig Plugin (https://twiganything.com) and also API Endpoints for Twig. This all works except that I can’t find a way to get URL Request Parameters into the SQL Query in the Twig Plugin.

I have installed the URL Params Plugin is works well – I can get parameters and display them in the Twig template but I don’t know how get them in the SQL query.

I have raised this on the Twig Anything forum but as yet no response so any help or advice would be appreciated.