The ship was built according to the B445 design at the Adolf Warski Szczecin Shipyard, commissioned by PLO (Polish Airlines Oceanic). According to a source from PLO (official website), the ship in the final phase of construction was handed over (free of charge?)
the Chinese-Polish company CHIPOLBROK (then the name was changed to JIANG CHENG), and only later it went to COSCO. I haven't found confirmation of this information anywhere, so I treat it as uncertain.
The fact that on the same website, Polish Ocean Lines states that the ship was ordered and built at the Lenin Shipyard in Gdańsk does not add credibility, and this is completely absurd.
Comparing the photograph of m/v JIANG CHENG with the photographs of the B445 ships, which carried the Polish flag, we see quite different shapes and sizes of funnels. The technical data of this ship are very similar to sister ships of this type.
However, I will provide the ones I found on the PLO website.

Original name: WŁADYSŁAW IV
Vessel type: general cargo ship
Year of construction, shipyard: 1972, B-445 (Gdańsk - obvious error)
It should be: Adolf Warski Szczecin Shipyard.
Period of operation in PLO: 1972 - 1972
What's next: given free of charge (ChPTO, Iang Cheng)
Load capacity: 8258 TDW
Passengers: 12 in six cabins
Total length: 145.3 m
Width: 18.8 m
Draft: 7.3 m
Main Engine type: H.CEGIELSKI-Sulzer 7RD68
5884 kW 8000 horsepower
Speed: 17.5 in
5 holds, 5 hatches.