Get value from nested header

Hi

I have a header coming from downstream that looks something like this:
“subjectdn: serialNumber=randomnumbers, ST=someStateOrProvinceName, L=someLocality, C=someCountryName, O=someOrganizationName, OU=someOrganizationalUnit, CN=someCommonName” - so basically some fields from the client TLS certificate. TLS is terminated downstream.

How can I extract the value of sertialNumber? I can get the whole subjectdn with capture.req.hdr(subjectdn) but using it later will just give me the last CN=someCommonName value.

Is it even possible without LUA?

Thanks in advance!

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