December 3 is approching so I’v pushed to https://github.com/jbvignaud/cts-submit a small tool that submit certificates and generate the correct TLS extention that will provide those info to the browser.
written in php, command line tool, but you can extract what you need as it’s a very simple tool.
basically use it like this (dont forget chmod +x):
./cts-submit.php cert.pem lets-encrypt-x1-cross-signed.pem > cert.sct.pem
Then use SSLOpenSSLConfCmd ServerInfoFile path_to/cert.sct.pem in the corresponding virtual host.
I dont know if it can work with other http server. it needs apache 2.4.8 and openssl 1.0.2