Custom Explorer Map leading to any structure

Hello, I've tried multiple things I've found on the internet about this but nothing has worked so far (most before 1.20.1 so maybe that's why). Basically I am trying to include a custom "Explorer Map" in a loot table that can lead to any structure, even a modded one. Does anyone know how to go about this, or if it's even possible anymore as of 1.20.1? Here's the loot table code for finding a Buried Treasure map in a Shipwreck for reference that I've been trying to work with
      "bonus_rolls": 0.0,
      "entries": [
        {
          "type": "minecraft:item",
          "functions": [
            {
              "decoration": "red_x",
              "function": "minecraft:exploration_map",
              "skip_existing_chunks": false,
              "zoom": 1
            },
            {
              "function": "minecraft:set_name",
              "name": {
                "translate": "filled_map.buried_treasure"
              }
            }
          ],
          "name": "minecraft:map"
        }
      ],
      "rolls": 1.0
    },```