Special Mail Tags – [_serial_number]

Hi,

I would like to check possible to record this tag [_serial_number] into google sheet?
I key in “serial-number” in google sheet row 1, but the data not capture.

[_serial_number]
This tag will be replaced by a numeric string whose value increments. Requires Flamingo 1.5+ be installed.
https://contactform7.com/special-mail-tags/

The page I need help with: [log in to see the link]