Defining and array field?

I am trying to define a fairly complex nested field set. Below is an example.
How do I define an array in the field definition?

const fields = [{
  name: 'someField',
  label: 'Some Field',
  rules: 'required|string'
}, {
  name: 'clients',  //  This need to be an array of clients.
  label: 'Clients',
  fields: [{
    name: 'title',
    label: 'Title',
    rules: 'required|string'
  }, {
    name: 'firstname',
    label: 'Firstname',
    rules: 'required|string'
  }, {
    name: 'surname',
    label: 'Surname',
    rules: 'required|string'
  }],
}];

example JSON:

{
  someField: 'value',
  clients: [{
    title: 'Mr', 
    firstname: 'John', 
    surname: 'Smith',
  }, {
    title: 'Mrs', 
    firstname: 'Susan', 
    surname: 'Smith',
  }],
}

[simon998yang]

Even it’s not straight-forward, is there a way to use Unified Properties to define an ‘array’ field? I’d like to use unified properties as i can keep all the info regarding one field in one place.

[Dakkers]

@foxhound87 is it possible? (regarding question above)