Import Biomes graphs into your World graph. The default implementation of the Biome node will only contain the Output Height data, which, in combination with Apply Mask and Combine nodes can provide the final desired height map.

You can then use Global Inputs and Global Outputs to enable more ports as Inputs or Outputs (as shown with the Density). In addition, this nodes will allow you to define default data in case the biome is used as is, instead of inside a Biome Node.