Kirigami.FormData.labelAlignment
https://kde.org/announcements/frameworks/5/5.75.0/
Add Kirigami.FormData.labelAlignment property.
TextArea {
id: toolTipSub
Layout.fillWidth: true
Kirigami.FormData.label: i18n("ToolTipSub:")
Kirigami.FormData.labelAlignment: Qt.AlignTop
text: plasmoid.configuration.toolTipSub
}