How to flatten select results from query with left joins (one-to-many)?

// NOTE: I've read a portion of the docs and it says something like //using a reduce function. I'm looking for a solution that is more // of an abstraction that works out of the box - just like how
// things are when you use a relational query (i.e., findMany)
[
  {
    person: {
      id: "P1",
      name: "Jane Doe"
      ...
    }
    hobby: { id: "H1", ... }
  },
 {
    person: {
      id: "P1",
      name: "Jane Doe"
      ...
    }
    hobby: { id: "H2", ... }
  },
{
    person: {
      id: "P3",
      name: "Bob Smith"
      ...
    }
    hobby: { id: "H5", ... }
  }
]

[
  {
    "id": "P1",
    "name": "Jane Doe"
    "hobby": [
      { "id": "H1", ...  },
      { "id": "H2", ...  }
    ],
    ...
  },
  {
    "id": "P2",
    "name": "Bob Smith"
    "hobby": [
      { "id": "H5", ...  }
    ],
    ...
  }
]