ç != hj
ETA: Wikipedia notes:
> The sound at the beginning of huge in most British accents is a voiceless palatal fricative [ç], but this is analysed phonemically as the consonant cluster /hj/ so that huge is transcribed /hjuːdʒ/. As with /hw/, this does not mean that speakers pronounce [h] followed by [j]; the phonemic transcription /hj/ is simply a convenient way of representing the single sound [ç].
So maybe ç == hj.
https://en.wikipedia.org/wiki/English_phonology#cite_note-18
Example: https://youtu.be/oSIPAMoCzhA?t=195
I recommend you read up on English phonology, as a video for German learners really isn't a good source.
Yes, one does not NEED to have the mouth open wide to express the "voiceless palatal fricative" but if you do not do it with a "slight smile" as described in that video it will not sound right.
I truly hope you know something about German pronunciation, otherwise I don't know what would compel you to even comment on the thread.