Koumas, who advanced through the LFC Academy to debut under Jürgen Klopp in February 2024, completed the past club campaign at Hull City as they were promoted from the Championship play-offs.
Versatile to play across the attacking positions, Bellamy intends to mould him as a centre-forward when representing his country.
“[He is a] nine because we don’t really have any nines coming through and we do have a lot of wingers, brilliant wingers,” he said.
“He could definitely be a huge asset for us on the wing but, due to our lack of nines coming through the system, we’ve used him a lot in training that way and he’s really been electric.
“There’s a lot to like about Koumy. He’s such a young player and I’m over the moon he got his goal because he’s deserved it.”