How to update values of 1 existing collection field via CSV import

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//I don't know if it will help but. I found such a solution to update only a specific field in //a collection.
//Suppose the field to be changed is phone only
let phone = $w('#phoneInput').value

//For example : The row id you want to change
let rowId = "bfc331e0-9459-4169-b8ae-1fde956caefc"

wixData.query('yourCollection')
.eq('_id', rowId)
.find()
.then((results)=>{
	if(results.totalCount > 0){
		let title= results.items[0].title
		let firstName= results.items[0].firstName
		let lastName= results.items[0].lastName
		let email= results.items[0].email

		let toUpdate = {
			_id: rowId ,
			title: title,
			firstName: firstName,
			lastName: lastName,
			email: email,
			phone: phone 
		}

		wixData.update('yourCollection', toUpdate)
			.then((result)=>{
			console.log(result)
		})
      }		
})