Mojave Virtualbox no sound.

Hello, I installed MacOS 10.14 in Virtualbox in my Linux machine. Everything works quite well, but the sound. My sound chipset is:

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00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)

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and I also have the sound card from the Nvidia gpu:

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~ cat /proc/asound/cards

0 [HDMI ]: HDA-Intel - HDA Intel HDMI

HDA Intel HDMI at 0xf7a14000 irq 34

1 [PCH ]: HDA-Intel - HDA Intel PCH

HDA Intel PCH at 0xf7a10000 irq 35

2 [NVidia ]: HDA-Intel - HDA NVidia

HDA NVidia at 0xf7080000 irq 17

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Do you know hot to fix sound in a Mojave Virtualbox guest? I read somewhere I need to install some kext files, which I think are somewhat equivalent to kernel modules, right?

Thanks!