How to enable HTTP/3 in Safari 14 on macOS Catalina?

It's said that the safari 14 will have HTTP/3 shipped, but I have captured packets using Wireshark find that no QUIC packets were captured. How can I enable HTTP/3 on my Mac? Is it because HTTP/3 will only come alone with Big Sur?

It seems that QUIC is implemented in user space. Why apple wants to integrate HTTP/3 into the OS level.
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Settings > Safari > Advanced > Experimental Features > HTTP/3
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