Webflow Integration with Zoho flow

Hi Support Team, I am struggle using the data that is sent from a Webflow form. The form for contact us and newsletter subscription with 'First Name", "Last Name' and 'email' fields. The flow test I get the below data sent from Webflow.

{
	"site": "609e864130cccb7ac3236415",
	"data": {
		"Contact Phone Number": "+353838078001",
		"Email": "myemail@email.com",
		"Message": "gggggggg",
		"First Name": "myFname",
		"Last Name": "myLname"
	},
	"d": "2021-05-15T17:29:36.623Z",
	"name": "Contact Form",
	"id": "60a00500d4a7d802038f21c5"
}

When trying to use this data in any of the flows, the variable is ${trigger.data} but how do I use the 'First Name' and 'Last Name' fields within this variable?