How to Add Serial Number to BIOS?

[rhd]

I have an H470M Plus Asus MB, when I run:

Code:

Get-WmiObject win32_bios

in Windows 11 PowerShell it gives me this:

Code:

SMBIOSBIOSVersion : 1620

Manufacturer : American Megatrends Inc.

Name : 1620

SerialNumber : System Serial Number

Version : ALASKA - 1072009

How can I add a serial number to the BIOS? I can access the BIOS and flash it no problem, just not sure how to add a serial. 
I want to add a serial to control/filter network device access.

Thanks