No Index Google

I am creating testimonials page for my site. My testimonials can contain very personal/private matters that they may not necessarily want their information public on the Internet. I want them to share their image and full name to bring more authenticity to their testimonial. I was thinking about turning indexing off on the image and their name using the following:
https://perishablepress.com/tell-google-to-not-index-certain-parts-of-your-page/
How would I go about adding this tag to the HTML within the testimonial for their full name and image?

I was thinking something like the following:

<!--googleoff: index-->
<img>img.png</img>
<p>my testiminonial</p>
<p>my full name</p>
<!--googleon: index>

Thanks,
Steve

https://ww.wp.xz.cn/plugins/strong-testimonials/