Does anyone know how to get the overridden value of a dimension in a drawing if the value is a string? (Let's say the Letter "A" for example)

I have the DisplayDimension, but GetOverrideValue only returns a double. GetOverride returns a bool, so I can tell a dimension is overwritten, but still no value. GetText doesn't seem to return the value either.

The users will overwrite the dimension with a Letter to reference a table in some situations. I would like to be able to extract the letter(s) used.

Thanks