WhatsApp Quick Start: Change the default salutation to first name only

Title: WhatsApp Quick Start: Change the Default Salutation to First Name Only

Description:
When I send a direct message from a contact’s profile using the WhatsApp icon (without a template),

chat is currently always pre-filled with the fixed greeting “Hello [First Name] [Last Name].”

It would be much more personal—and more professional in everyday use—if only the first name were used by default (i.e., “Hello [First Name]” instead of the full name). Please adjust the default variable for this quick access accordingly.