How to size a QR image in a report PDF?

How to size a QR image in a report PDF?

I've created a report template for a client record which has a QR code field.

I've tried inserting the field into a paragraph element and also as a field element that I have resized. 

The QR code is shown at the same, large size on the page either way.

Is there a way to set its size on the page?