Entries

{
    "fields": [{
        "group": "Default",
        "name": "Entries",
        "handle": "entries", // This line is optional
        "instructions": "This is not a required field.",
        "type": "Entries",
        // typesettings & everything inside is optional
        "typesettings": {
            "sources": ["singles"], // Use the handle of the Entry or leave blank for all. To select Singles use the string "singles".
            "limit": 3,
            "selectionLabel": "Add an entry"
        }
    }]
}