The Flight 1 Arleigh Burke DDGs (21x units in total) do not feature any helicopter hangars, only a helipad. It was only from Flight 2 Burkes onwards where a dual helicopter hangar design is adopted.
Plus, there have been no plans to retrofit helicopter hangars on the Flight 1 Burkes, despite many of the Flight 1 Burkes having already reaching or went past their respective MLU-ages. In retrospect, I don't think that the 1st and 2nd batches of the 052Ds would be modified with longer helicopter pads either.
Besides, there are only 13x 052Ds in the 1st and 2nd batches. The associated money, effort and resources would be much better spent towards upgrading the radars, sensors & computing systems of the older 052Ds and building more 052DGs & developing next-generation DDGs, given that China could well reach 40x 052D/DGs by 2030.