Don't think there are any other weapons fitted on 2901 other than the main gun for defense. It will make her looks like a warship in coast guard paint if you add more lethal/offensive weapons considering her tonnage. That will defeat the purpose of the ship's desgin as a non-threaten but long endurance law enforcement coast guard ship.
I am not talking about large weapons.
I would be talking like a couple of those 30mm auto cannons they have on the Type 056, and perhaps some 12.7mm mounts typically found on Coast Guard vessels. Such weapons would not at all be out of character for armed Coast Guard vessels.
I expect these vessels, with their long range and sustainment capability, will ultimately be used by the PRC for long range escorts and patrol of critical economic oriented vessels and sea lanes.
Similar to how the Japanese Coast Guard uses their two Shikishima Class PLH 9,300 ton Coast Guard vessels.