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Google is wishy-washy on the answer to this, but Rand's answer is the one I lean on - https://moz.com/community/q/moz-s-official-stance-on-subdomain-vs-subfolder-does-it-need-updating
I think that's a great thread to review.
https://moz.com/community/q/moz-s-official-stance-on-subdomain-vs-subfolder-does-it-need-updating
It's really a design exercise. You just put your dynamic span tags in the HTML positioned on top of the image.
There's a number of resources - this is one: http://www.the-art-of-web.com/css/textoverimage/
Good luck!
It can be done, but I would recommend the HTML overlay the graphic. Then users have the ability to click-and-dial direct in mobile.
