KeyShotXR currently doesn't support callouts and hotspots. However, if you would like to add images or text to your render. However, you can still apply hotspots and callouts in your html editor or through a third party called Sirv.* 

How To Apply HotSpots In Syrv
Hotspot Example

Below you will find other relevant resources.

KeyShotXR Tutorials
KeyShot Manual: KeyShotXR

*We suggest contacting a web expert for advice with these third-party applications.