Static IP and PPPoE on same port

I need to make two connections (PPPoE + static IP) using only one physical port. The PPPoE connection is already configured and running, just need to configure static IP over PPPoE. I’ve tried several ways but did not work.

Example:

MikroTik IP: 192.168.88.1

I need to access that IP over PPPoE: 192.168.87.1


Thanks in advance if anyone can help me.

You mean the pppoe interface does have a static IP and does not get it from the server?
In that case just put the IP on the profile you are using for the pppoe interface (probably the default profile). You can find it in /ppp profile and there set the local address