<< Solved >> DELL 7020 SFF No DP audio on Big Sur/Monterey

I've recently completed a Big Sur/Monterey MacOS build on a DELL 7020 based on the Golden Build: The 4K Dell OptiMac - 9020 MT - Core i7-4790 - Radeon RX 570 - LG 4K IPS Monitor. Everything works really well (even got native NVMe support) except no audio over display port. The OS does not recognize audio over DP (have check both DP ports) and no option is displayed in the System Preferences.



Would appreciate advice or hints on how to solve this issue.

I've attached my current EFI folder for reference.

@kuty provided the solution. Link to the solution.