Input format for skins

Hi , love your work - start there 

 What format should i put skins in ?

All item skins together like the 1st block or the 2nd block? 

1st block:

        1660293384,   ////pants to
        1787243248,
        1100930207,
        888360095,
        1961465777,
        1406835139,    ////here
        1660290744,  ///hoodie to
         1787216403,
         1100931254,
         897890977,
         2351687115 ///here

2nd block:

 "Item Shortname": "hoodie",
      "Skins": [
         1660290744,
         1787216403,
         1100931254,
         897890977,
         2351687115
         ]
        },
        {
      "Item Shortname": "pants",
      "Skins": [
        1660293384,
        1787243248,
        1100930207,
        888360095,
        1961465777,
        1406835139
         ]
        }

id assume it will be the same in epic loot also, 

thanks in advance