You can set near anything inside the tooltips (images, texts, numbers).
This is done using custom tokens.
In order to set custom tokens in tooltips you need to create a custom token with structure of
data-__ where the __ will be what ever you choose.
If I want to set a custom tooltip for full names I would do this as such:
data-fullName:[Joe Doe, John Lee, Jane Kane]
And subsequently display these custom tokens in the tooltip in the text by using
Here is a demo to show you how this is done: DEMO