OC5.8 what do I need to setup Sapphire Nitro+ Vega 64 card with iMac19,1 properly?

Planning to install Mojave or Catalina on a new setup Gigabyte Z390 Aorus Pro Wifi / i9-9900K / 64GB RAM / TP-Link T9E wifi card / USB bluetooth 4 dongle

Don't have the MB yet, but preparing the OC files.

Searched some good fellows putting up their setup similar but not exact as mine.

https://github.com/blacklizard/gigabyte-z390-aorus-pro-wifi-hackintosh-opencore

and
https://github.com/blacklizard/gigabyte-z390-aorus-pro-wifi-hackintosh-opencore

But I'm lost on how to put together DSDT and/or setting in config.plist to use Vega 64?