Is it possible to add hosting to some image hosting in share menu?
You can use ImageShareUr which adds a share extension for uploading to Imgur.

Choose More to enable the extension for the first use, then you can select an image and choose Share → Upload to Imgur and follow the instructions.

                 


Despite the author's message on the page that it doesn't work in Sierra, I've just tried it on 10.12.4 and it works great.