Add Text Watermark To BuddyPress Profile Pics

I would like to add a text watermark to my members' profile pics.

I am finding many plugins that will add text watermarks, but they add them to all images on the website. I want them ONLY on my my buddypress profile pics, and if at all possible, I'd like it to be optional.

Is there such a plugin? I have been unable to find one.
Thank you.