Hi @gwizard,
Good news! You can adjust the font sizes of the metric label directly inside the settings of KPI Metric. You can check this out for more details: Launched: New Styling Options for KPI Metric 
- Product Releases
I hope this helps 
Hi @gwizard,
Good news! You can adjust the font sizes of the metric label directly inside the settings of KPI Metric. You can check this out for more details: Launched: New Styling Options for KPI Metric - Product Releases
I hope this helps