> Another thing I noticed is the non-functioning of the variables:
> 
> MITMPROXY_SSLKEYLOGFILE
> SSLKEYLOGFILE
> 
> here is some doc: https://docs.mitmproxy.org/stable/howto/wireshark-tls/
> these variables are used to export the encryption keys

Read that last line again and ask yourself why this isn't supported by
libssl.