Hi @Nipeg ,
If i understood correctly, you want to add some ‘tags’ that is clickable. And when it’s clicked, it will travel you to that location displaying another spherical panorama, am i right?
Take a look at this: vrto.me . They have an interface where you upload your spherical panorama (.jpeg / cubemap) and add ‘hotspots’.
This websites offering similar features as well: 360pano.eu ,
Also take a look at this: irisvr.com/prospect . They seem to have a SketchUp plugin!
If you want to create spherical panoramas with SketchUp styles, have a look at this plugin: WebGL Cubic Panorama .
Also as Aaron mentioned, there are renderer plugins such as Vray and Thea for photorealistic panorama creation.