How do I install this NVRAM fix?

In the post linked here, it says:

Do note that it requires LPCB in your DSDT but this is super common on Z390, you can verify be searching for PC10.LPCB.

and

Once you have the SSDT made, drop this into EFI/OC/ACPI (remember to add it to the config as well if run OpenCore)

I run OpenCore, and I want to know 2 things:

1. How do I search for PC10.LPCB
2. How do I add the SSDT into config.plist?

Any help is appreciated