Ssl decryption monitoring

Hi all,
I have a system like this:
All the traffic that goes through out system has been mirror by a TAP, then the TAP send all of that traffic to my suricata server.
I want to decrypt all the ssl traffic from the internet that accessing our web server, i do have the ssl key.
I have tried sslsplit by it seems that it is a mitm type so it does not work for me.

Is there way to decrypt all this mirrored traffic?

Thanks for your time.