Hello,
This is the full export of my IPSec setup, you have to have a paid protonvpn account to be able to do this.
# may/07/2020 17:11:44 by RouterOS 6.46.6
/ip ipsec mode-config add connection-mark=ProtonVPN name=ProtonVPN responder=no
/ip ipsec policy group add name=ProtonVPN
/ip ipsec profile add dh-group=modp4096,modp2048,modp1024 dpd-interval=disable-dpd enc-algorithm=aes-256 hash-algorithm=sha256 name=ProtonVPN
/ip ipsec peer add address=193.148.18.40/32 exchange-mode=ike2 name=ProtonVPN profile=ProtonVPN
/ip ipsec proposal add auth-algorithms=sha256 enc-algorithms=aes-256-cbc name=ProtonVPN pfs-group=none
/ip ipsec identity add auth-method=eap certificate="" eap-methods=eap-mschapv2 generate-policy=port-strict mode-config=ProtonVPN password=<password> peer=ProtonVPN policy-template-group=ProtonVPN username=<username>
/ip ipsec policy add dst-address=0.0.0.0/0 group=ProtonVPN proposal=ProtonVPN src-address=0.0.0.0/0 template=yes