In Mingle's wiki editor you can format table header cells with the string "_." (without the quotes).

Thus, this markup:

|_. Metric |_. Points |

| Committed | {{value query: SELECT SUM(Points) WHERE Type = Story and 'Iteration Committed' = (Current Iteration)}} |

| BA Sign Off | {{value query: SELECT SUM(Points) WHERE Type = Story and 'Iteration of BA Sign Off' = (Current Iteration)}} |

| QA Sign Off | {{value query: SELECT SUM(Points) WHERE Type = Story and 'Iteration QA Ended' = (Current Iteration)}} |

| Currently Blocked | {{value query: SELECT SUM(Points) WHERE Type = Story and Iteration = (Current Iteration) And Blocked = Yes}} |

| Completed | {{value query: SELECT SUM(Points) WHERE Type = Story and 'Iteration Done' = (Current Iteration)}} |

Produces this table: