First things first. Check the tire itself to determine the max PSI so that you don't exceed that.
As for what pressure to use? Somewhere around 38-42psi in a car that's lightly loaded (you & passenger + some luggage). Increase that a bit to 42-45psi if you're fully loaded (5 people +full of luggage). Check your sticker on the B pillar:
Basically same pressure as with any other LI91 rated tire.
The picture is probably showing Golf R or Clubsport tire pressures since
235/35 R19 is only available from factory on the R and Clubsport/CSS.
Your much lighter and slower 1.4 TSI will easily be happy with the same
or slightly lower pressures.