IPsec VPN without using Client

Since Fortinet is transitioning from SSL VPN to IPSec VPN, we would like to request your guidance regarding this scenario. Our client currently uses SSL VPN for their remote users. These users access the network from phones and tablets without FortiClient, simply by entering an IP address and port in their browser. Configuring a VPN client on these devices would be cumbersome for them. However, IPSec VPN does not natively support browser-only access in the same way. Could you advise on the best approach to implement IPSec VPN for this use case while keeping remote access simple for users on mobile devices? Thank you for your support.