How to change font size and color of legendbox entries and chart title

I add the chart title like below

 chart[unique].setTitle(nn).setPadding({
        bottom: -2,
        right: -2,
        top: -36,
        left: -2
    }).setMouseInteractions(false);

How do I set the font size? I tried setFont((font) => font.setSize(12)), but it's not working.

Also I am not able to add it to legendBox:

legendBox["axis"].add(line[name], undefined, ' ').setText(entryname);

I want to set font size and color for chart title and legendbox entries or full legendbox.

ChartXY title font

LegendBox title and entries can be styled by methods of the LegendBox Builder (setTitle, setEntry):

const legendBox = ChartXY.addLegendBox(
    LegendBoxBuilders.VerticalLegendBox
        .setTitle((title) => title
            .setFont((font) => font.setFamily('monospace'))
        )
        .setEntry((entry) => entry
            .setFont((font) => font.setSize(10).setStyle('italic'))
        ),
)

EDIT

ChartXY title color