Add/Remove DNS Servers via Script

RouterOS Beginner Basics
1

Does anyone know how to add and also remove dns servers via script ?

E.g. I use google dns 8.8.8.8, 8.8.4.4 and open dns 208.67.222.222, 208.67.220.220.

I want to create two scripts which are:

  1. add the new dns servers
  2. remove certain dns server (e.g. I want to remove 8.8.4.4)