The 18-year-old centre-back originally joined the Reds from Everton at U12 level.
Good on the ball and strong in the air, Jonas has progressed through the age groups to become a regular member of Barry Lewtas' U21s squad.
He has also gained experience in the UEFA Youth League and Papa Johns Trophy this season.
A member of a proud Merseyside sporting family, Jonas' ability has been recognised at international level too and he has captained England U18s.