ERC1155 get list all tokens to owner

Smart Contracts
1

I'm trying to use ERC1155 to create characters for my game, however, my characters will have a unique code called "DNA", I'm looking through the ERC1155 documentation and I need to define an "ID" for an NFT that I will create an example:

// contracts/GameChar.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;

import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol";

contract GameChar is ERC1155 {
    uint256 public constant CHARACTERS = 0;
 
    constructor() public ERC1155("https://game.example/api/item/{id}.json") {
              _mint(msg.sender, CHARACTERS, 1, "");
    }
}

But I'm using it in the following way...

contract GameChar is ERC1155 {
    uint256 public constant CHARACTERS = 0;
 
    constructor() public ERC1155("https://game.example/api/item/{id}.json") {}

    function invokeHero(unit _dna) public {
       _mint(msg.sender, _dna, 1, "");
    }

}

My problem is that I need to have a List of all DNAID (TokenID) of an owner, or I need to have a way to validate that a DNAID is really from a person.

How do I get this?