How to define Dictionaries using Stoplight Studio UI

I am trying unsuccessfully to create a Model that matches the example below using the Stoplight Studio UI. It contains 2 nested Dictionaries. Is there a way to do this?

{
  "gateways": {
	"DE": {
	  "paypal": {
		"mode": "sandbox",
		"methods": [],
		"account": "paypal_DE",
		"authorization": {
		  "client_id": "AVM8OuLVHPJJFABHQdXdrmV0QZU5jS0w_AYtMzijVqm1etflKYpKXdQoqMUX5b5mQqHrRhKBG_oKPb5i"
		}
	  },
	  "stripe": {
		"mode": "sandbox",
		"methods": [
		  "stripe_cc",
		  "stripe_sepa"
		],
		"account": "stripe_DE",
		"stripePublishableKey": "%STRIPE_PUBLISHABLE_KEY%",
		"authorization": {
		  "accountId": "acct_1BwayBFPhnvmjlYU"
		}
	  }
	}
  }
}