Multiple PPPOE sessions on one device

Can someone help me please with configuration of Mikrotik RB750 (192.168.88.1).

LAN1 is WAN port from server (no DHCP, only pppoe via radius)
LAN2 → to first computer (DHCP range 192.168.1.2-192.168.1.10)
LAN3 → to first computer (DHCP range 192.168.2.2-192.168.2.10)

I want to have two pppoe sessions on RB750, one for LAN1 (with external IP address1), and second for LAN2 (with external IP address2).

Can someone write a sample configuration for this, please?

Thank you.