How to display a "string" metric


I want to display a single string in my dashboard - a hash that represents the commit hash of the repo from which the visualized data was generated.

Ideally I'd like to use the "Metric" visualization, since it's one single big box of text, but it only supports numerical values. Do you have suggestions on how I could achieve this goal?

There is of course markdown, but that is hardcoded text, not fetched from the index.