Webhook to Update SFDC Case Web Fields

Is it possible to update Salesforce's Web Email, Web Name, Web Company, and Web Phone fields via a Webhook? I've made the fields editable in the page layouts, but so far, the webhook does not update them. Here's the Webhook code I'm using:

&SuppliedEmail={{Lead.Email Address}}

&SuppliedCompany={{Lead.Company Name}}

&SuppliedName={{Lead.First Name%20Lead.Last Name}}

&SuppliedPhone={{Lead.Phone Number}}

Is there a way to get this to work?

Thanks