RAK7249 - openVPN alternative

Hello everyone,
I have a RAK7249 gateway for testing.
I would like to install on the OpenWRT wireguard as an alternative to openvpn. Did anyone succeed in doing this?
At the moment:
opkg install wireguard
Unknown package ‘wireguard’.
Collected errors:
* opkg_install_cmd: Cannot install package wireguard.
Thank you for your help.