I am not very good at CSS, so please submit a pull request if you are great at frontend development.
This page will allow you to upload photo spheres to Google Maps after the idiots at Google removed their perfectly working StreetView app.
Images must have the proper 360 degree file properties, you will need to figure out how to add this metadata. Google pixel photosphere photos work perfectly, I have yet to figure out how to get my DJI drone 360 photos working.
Latitude and Longitude is not required if your photo already contains location data, however if it doesn't, then use https://www.latlong.net/ to pinpoint coords.