Specify taxonomy category to show via admin form?

I’m building a landing page template that draws in portfolio pages from my /work page. I can show work from specific categories no problem using findTaxonomy() and hard-coding it into the mark up, but I want to be able to specify the category to show work from, from within the admin page.

Ideally I want to be able to just use a text or selectize field and insert its value/values into the findTaxonomy() method like so … ({ category: ['MY CATEGORY', 'ANOTHER']} , or ) %}

Is this possible, and if so what would I start looking for docs on doing this?