def MakeCustomDataEx(ea, size, dtid, fid):
    return idaapi.doCustomData(ea, size, dtid, fid)
Check the lang attr.
dataset/ETHPy150Open EiNSTeiN-/idapython/python/idc.py/MakeCustomDataEx--crossover with--dataset/ETHPy150Open project-fondue/python-yql/yql/tests/test_yql_object.py/YQLObjTest.test_yqlobj_lang