text with multiple size

Hello there,

I've a label Slopevalue

<label id="Slopevalue" x="220" y="110"  color="Gfx.COLOR_BLACK" justification="Graphics.TEXT_JUSTIFY_CENTER" font="Graphics.FONT_LARGE" />

I fill it in my View like that:

        var slv = View.findDrawableById("Slopevalue");
        slv.setText(slopeValue.format("%d")+ " %");

What I want is to have the Text in large and the unit (%) in tiny (or medium) like on this picture: (e.g 232w)