Is there a possibility to translate attributes (fields)

Hi,
i have the following structure
image

and the following translation file

{
	"FirstName": "Vorname",
	"label.FirstName": "Vorname",
	"LastName": "Nachname",
	"label.LastName": "Nachname",
	"EmailAddress": "E-Mail Adresse",
	"label.EmailAddress": "E-Mail Adresse",
	"WhatsAppNumber": "WhatsApp Nummer",
	"label.WhatsAppNumber": "WhatsApp Nummer",
	"description.FirstName": "Der Vorname der Kontaktperson",
	"description.LastName": "Der Nachname der Kontaktperson",
	"description.EmailAddress": "Die E-Mail Adresse für Benachrichtigungen",
	"description.WhatsAppNumber": "Die WhatsApp Nummer für Nachrichten"
}

But it doesnt work for me.
What am i doing wrong?