How to: Nested or Inner Blocks

[djmtype]

I basically want to create a wrapper block whereby I can nest other blocks inside that I've already created for the flexible editor.
For example, does this require one of the relationship fields or repeater? I'm a bit confused.

[djmtype]

Correct me if I'm wrong, this is possible just by adding a M2A field to my wrapper collection and adding the relationships which include the other collections.

However, I'm not sure how to return them like the others.

Current fields: fields: ["*", { "*": ["*"] }, "editor_nodes.*", "editor_nodes.item.*"],

I get data: null:

{
  type: 'relation-block',
    attrs: {
      id: 'b92003fe-a458-4160-b179-5c24914f4a5c',
      junction: 'page_editor_nodes',
      collection: 'wrapper',
      data: null
    }
}

[djmtype]

I forgot to enable READ permissions on the wrapper collection 🤦