Looker Studio - Waterfall Chart - Data Label issue

Issue:
In the Waterfall chart if you turn on Subtotal and Data Labels setting, the Data Label for the Subtotal does not show a - (minus) sign for a negative number even though the tooltip shows a negative number the bar is red.

Screenshot:
<img width="394" alt="image" src="https://user-images.githubusercontent.com/120379017/207029999-c647ec75-7535-4d81-ba99-f49ef46b0187.png">
