Form Calculation Dynamic Data Tag - how to use

Hi all, I have a silly question.

I would like to display the value of a calculation field in a heading. So I inserted a heading element and entered: {brf_form_calculation:8ce288} into it. But on the front end it just outputs: {brf_form_calculation:8ce288} so I think I must be using it wrongly. Where should I enter the tag to enable it to output onto the frontend?

Seems obvious now, but you must enable ‘Dynamic Data Tags’ in Bricksforge > Extensions for this to work.

Mentioning this in the docs would be helpful.