Hot Conntect with Mango from Outside my Home VPN Server

Hello,
I bought that Mango Router to get Access on my Home VPN from my Sisters place. I Have on my home Router a 2 VPN Servers a L2TP and a IKEv2 that works OK
But on the Mango Router I can only choose commercial VPN providers, but I like to choose my own VPN Service. Is there a way to set up the VPN service maually?
Thank you and kind regards, Andres

Yes, you can set up VPN as well - but neither L2TP nor IKEv2 is supported by the GL GUI.
See WireGuard Client - GL.iNet Router Docs 3 or OpenVPN Client - GL.iNet Router Docs 3