SymbolLayer Properties textFont

[passmanagerapp]

I want to specify the textFont. I am able to use Ubuntu Bold for example, but when I want to use Muli Bold, it doesn't work.

       `val count = SymbolLayer(COUNT_LAYER, SOURCE_ID)

        count.setProperties(
        textField(toString(get(PROPERTY_MANUAL_CLUSTER))),
        textSize(11f),
        textFont(arrayOf("Muli Bold")),
        textOffset(arrayOf(4.45f, 3.80f)),
        textColor(Color.rgb(55,124,246)),
        textIgnorePlacement(true),
        textAllowOverlap(true))`