There is a uservoice request for WireGuard: https://protonmail.uservoice.com/forums/284483-feedback/suggestions/34116700--support-wireguard-vpn-protocol https:/

There is a uservoice request for WireGuard: https://protonmail.uservoice.com/forums/284483-feedback/suggestions/34116700--support-wireguard-vpn-protocol https://protonmail.uservoice.com/forums/284483-feedback/sugg... (but I don't know if Proton looks at these requests, the last response from administrators was in 2016).