Fetch Data from an external MSSQL Database in a Managed WP hosting

SO, my client is using a managed WP hosting, which is why I can't install MSSQL drivers in his server. I am building a plugin for him to fetch some data from their office's MSSQL server. Now, I have built the plugin in my localhost by connecting directly using SQLSRV. But this plugin won't work on his site because I can't fetch the data without mssql driver.

Can you please guide me through this issue? How can I fetch the data with basic PHP or Javascript without depending on his server. Any idea for a workaround is appreciated.