Free remote access via open vpn on tp link AX 21

I’ve been searching and finding guides on Open VPN remote access, which I can set up. However, my router - TP Link AX 21 has Open VPN capability built in. I would like to utilize remote access to HA this way.
Can anyone direct me to the clear method to achieve this, please?
I’m running HA (Home Assistant 2023.2.5,Supervisor 2023.01.1,Operating System 9.5) on Rpi 3B, HE (connect via jason0x43/hacs-hubitat)

Thank you in advance!

This has nothing to do with HA.
This is a connection between you remote device and the router.
Once the connection is established, then it would be like the remote device is connected directly to your local network.