Find a pages field by variable

Is there a way to access a page field, while having the field name only in a variable?
This is a very smart way to handle a list of fields. But I was wondering, if there would also be a way to find just one single field?

I could imagine something like

$fieldname = 'description';
$page->findField( $fieldname )->kirbytext();

I tried with eval() but couldn’t get it to work, and its also not very elegant.
Thank you for your ideas!

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