Little to no Atlas Experience

Is there any way to create a new paletted permutation section to the blocks.json without copy-pasting the whole thing i.e can I append my own code.
For example if I just wanted to add the following paletted permutations:
  "sources": [
    {
      "type": "paletted_permutations",
      "textures": [
        "minecraft:beans/textures/baked_beans",
        "minecraft:beans/textures/canned_beans",
        "minecraft:beans/textures/coffee_beans"
      ],
      "palette_key": "minecraft:beans/palette/default",
      "permutations": {
        "green": "minecraft:beans/palette/green",
        "blue": "minecraft:beans/palette/blue",
        "iron": "minecraft:beans/palette/iron"
      }
    }
  ]
}```

Assuming it would correctly create the following textures in an atlas
```minecraft:beans/textures/baked_beans_green
minecraft:beans/textures/baked_beans_blue
minecraft:beans/textures/baked_beans_iron
minecraft:beans/textures/canned_beans_green
minecraft:beans/textures/canned_beans_blue
minecraft:beans/textures/canned_beans_iron
minecraft:beans/textures/coffee_beans_green
minecraft:beans/textures/coffee_beans_blue
minecraft:beans/textures/coffee_beans_iron