How to configure client for L2TP+IPSEC in OpenWRT

RouterOS Beginner Basics
1

Guys does anyone have step-by-step instruction how to configure L2TP+IPSEC client in OpenWRT 18?
There is a L2TP+IPSEC server (Mikrotik) with various clients but I can’t find any manual how properly configure L2TP+IPSEC client in OpenWRT 18.