Stream from websites that have no kodi add-ons

I was wondering how can I stream live contents from some websites that have not released any add-on for kodi.
Is this possible at all?

We believe this is a Kodi issue or a specific Kodi function and as such you should look at addressing the issue there. We are unable to resolve your issue. If you do believe that this is an OSMC specific issue, please let us know.