type: checkbox

values: [val1,val2,..] | [{"id":"id1","value":"value1"},{"id":"id2","value":"value2"},..]

{
  "DataBaseTables": {
     "TableName": {
        "interface": {
           "fields": {
               "field_name": {"name": "Opción Correcta", "type": "checkbox", "values": [1,2,3,4],"defaultvalue":1},
           }
        }
     }
  }
}

When you want to get the values from a external table/entity use:

external_values": "datastore|db"

entity: "table_or_entity_name"

"fields": "{id_fields},{others_fields}"

"linked_field": "{id_field_in_external_values}"

"fields": {
  "UserOrganizations": {"name":"Organizations","type": "checkbox","external_values": "datastore", "entity": "CloudFrameWorkOrganizations","fields": "KeyName", "linked_field": "KeyName"},
},

@Adrian Martinez con nombres de campos iguales en las 2 tablas no funciona