How to use custom font icons on tabIcon

How can i use some custom font icons available out there. I am able to do it for normal scenario but class does not works on tabs as it should work.

Below is an example, how can i change tabIcon in below code with class icons as we do normally -

<ion-tab [root]="tab1Root" tabTitle="Home" tabIcon="home"></ion-tab>

Leads are appreciated :slight_smile: