Where is 'uint256[] memory tokenTraits' defined in this NFT contract?

Hello,

I’m looking into NFT contracts and I am analyzing the infamous CREEPZ INVASION GROUNDS contract.

Viewable at https://etherscan.io/address/0xc3503192343eae4b435e4a1211c5d28bf6f6a696#code

On line 307 of CBCStaking.sol, the function _setTokensValues takes two arrays from memory as arguments, which are used to set the yield value ($loomi token) for a staked NFT. They are uint256[] memory tokenIds, and uint256[] memory tokenTraits.

function _setTokensValues(
      address contractAddress,
      uint256[] memory tokenIds,
      uint256[] memory tokenTraits
    ) internal {
      require(tokenIds.length == tokenTraits.length, "Wrong arrays provided");
      for (uint256 i; i < tokenIds.length; i++) {
        if (tokenTraits[i] != 0 && tokenTraits[i] <= 3000 ether) {
          _tokensMultiplier[contractAddress][tokenIds[i]] = tokenTraits[i];
        }
      }
    }

How was data first input into those arrays? Where are they first defined? tokenTraits[] in particular only exists in CBCStaking.sol as arguments for functions. Outside of that it is not present in any other creepz contracts.

How do they do it? If they are derived from the metadata somehow, where is the function responsible