PFA a sample hostapd.conf file with wpa3 support.
Make sure to enable CONFIG_SAE=y aand
CONFIG_IEEE80211N=yin your .config file while building the hostapd source.
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I am also using it. (cypress-fmac-v4.14.77-2020_0115.zip)
The following parameters are set in hostapd.conf for WPA3, and it's working fine.