core.json

{
   "name": "block.name"
  ,"type": "core/text"
  ,"blocks": [
     {"name": "some.block","type": "core/list"}
    ,{"name": "some.nested.block","type": "core/text"}
  ]
}

module.json

[{
  "reference": {
    "block.name":[
      {"addClass": ["block.name"]}
     ,{"removeChild": ["some.block"]}
     ,{"blocks":[
        {"name":"something.new","type":"core/text","template":"path/to/template.tmpl"}
      ]}
       
    ]
  }
  ,"blocks": [
    {"name": "new.block","type": "core/text"}
  ]
}]

• If there's a name, create a new block
• create each