How to force ui_text value to NOT be bold

Dashboard
2

Put this in a ui template node and set msg.className to widget (the widget bit can be whatever you like)

<style>
    
    .nr-dashboard-text.widget > p.value {
         font-weight:initial;
    }

</style

This perhaps explains it better How to use pay load in one text output trigger color applied to another? - Dashboard - Node-RED Forum (nodered.org)