fontSizeMode: Text.Fit not working with textFormat: Text.RichText but ₁ work only with RichText

[philxxx609]

Hello, I need to have subscript on my text in QML but it's only recognized with RichText but fontSizeMode: Text.Fit doesn't work with RichText , how can I make it work?

Text{
                id:endMainCharge01TpsDataTitle
                Layout.preferredWidth: parent.width/6
                Layout.preferredHeight: parent.height/14
                wrapMode: Text.WordWrap
                textFormat: Text.RichText
                text:"<small>Duration main charge 0.1C<sub>1</sub>A (min)</small>"
                padding: 5
                Layout.alignment : Qt.AlignRight
                fontSizeMode: Text.Fit
                minimumPixelSize: 1
                font:theme.headerFont
            }

thank a lot for your help!!