How to put HTML for the worksetItems?

Now, it is only text (example with the dashboard title):

worksetItems: [new sap.ui.ux3.NavigationItem("WI_home",{key:"wi_home",text:"Dashboard"}),

Do you know how to put HTML instead of text?

I need it to to put an image next to the title with the font :

<span class="icon-statistics"></span>

Vincent