The website provide an easy tool to generate Arduino code (like blocks or other drag & drop option to easily make a code). Would be possible take that Arduino code generated by the website and turn it into a .hex file that can then be use in the arduino-web-uploader button to upload it into an Arduino?
In principle yes, but this package is not sufficient because it requires compiled hex files. You need something else to compile it first, and I'm not aware of web software to do that
Considering a case of use where:
The website provide an easy tool to generate Arduino code (like blocks or other drag & drop option to easily make a code). Would be possible take that Arduino code generated by the website and turn it into a .hex file that can then be use in the arduino-web-uploader button to upload it into an Arduino?