Search web-part - auto select a filter

Hello, 

I am getting a bit stuck using SharePoint Online Search Filters/Box/Results web parts. 

I would like to filter my site's Pages using Tags that are being pulled from the Term Store via a 'Managed Metadata' column.

This is working, but I would like the ability to have one of the tags pre-selected, so users can only search for pages tagged with, say, "Intranet". Is this possible? 

If there is an easy way to filter on Choice, Text columns, I'd be keen to hear 🙂

Thank you.