Good day!
I can configure Port Knocking on OpenSense for You confidently and quickly because I am a certified network engineer (MTCIPv6E/MTCTCE/MTCNA) having over 10 years of experience in configuring, maintaining and troubleshooting of enterprise network devices, firewalls, and Linux servers.
Also, I did it before on MikroTik (RouterOS), IPTables (Debian 10), and pfSense.