as an OBJ is sufficient because you just want to change the shape like in Zbrush.
You can use the Morph Slider Editor or Edith Morph slider function to "send back to CC" like Zbrush does
the first One is creating a Morph, the second One is Update the Morph.
At the End it is the same Procedure that GOZ does, except not such elegance, like these Bridge.
Falls you want to make accessory or Cloth you need not import the CC figure back in CC, only the exta Mesh
for import such a Item use create Accessory in CC and bind it.
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liebe Grüße vidi