Adding dynamic watermark to images

I'm trying to add dynamic watermarks to images. This specific case is for a MaxDiff, but I would need to implement it across any future question types where I'm including images.

By dynamic, I mean I would like to use pass-through information (such as a unique ID or email address) and apply this to the watermark. That way, the images in a respondent's survey are all watermarked with their unique ID or email address.

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