Processing Twig in theme config text fields

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I’m wondering if there is a way to process twig in the text of a Theme field, the only thing I could find pre-existing was the evaluate() function but that expects just valid twig content.

e.g. the template I’m working on has a Copyright Footer field of type markdown and it’s rendered into the footer of the template using the markdown filter provided in GRAV.

{{ theme_config.copyrightFooter|markdown }}

So text like this:

© My Company, 2017
_Sydney, Australia_

Renders like this:

© My Company, 2017
Sydney, Australia

Ideally I’d like to be add some dynamic elements, like a date range for the copyright e.g.

© My Company, 2001 —  {{ "now"|date("Y") }}
_Sydney, Australia_