Waterlogged blocks in custom flat dimension

Is it possible to have a layer of waterlogged blocks in this superflat dimension? (Ive tried "block": "barrier[waterlogged=true]" to no avail). dimension code below:
{
   "type": "kelraw_ddm:inner_sea",
   "generator": {
      "type": "flat",
      "settings": {
         "biome": "kelraw_ddm:inner_sea",
         "layers": [
            {
               "block": "air",
               "height": 16
            },
            {
               "block": "barrier[waterlogged=true]",
               "height": 1
            },
            {
               "block": "water",
               "height": 1
            },
            {
               "block": "air",
               "height": 40
            },
            {
               "block": "barrier",
               "height": 1
            },
            {
               "block": "water",
               "height": 1
            }
         ],
         "structure_overrides": []
      }
   }
}