Interactive 360deg photo

Is it possible to add tags in a 360 degree photo. Similar to this

Website reference - Interior of the Limited Area Sentry Station (LASS) - SeekBeak

Any suggestion or help is appreciated

Sure is. You could check this post that came in just a couple of days ago. It would apply to you I believe:

Only thing is with your dome you have no meshes to point to. I would simply create POIs (Points of interest, a simple point/vector or an invisible cube or sphere, positioned at the location you want to pick and display your label.

Else, another solution would be to make use of the BJS 3D Gui controls.