You can potentially add a source record of data with that value. Depending on your source system, you might have various options (custom SQL, Union, etc...) but there might also be complications based on the complexity of your data, filtering, etc...
Do you happen to have any details?
The data isn't complicated at all. This is just more for convenience and to clean up the way my charts look. I actually wanted to avoid adding 0 value records which I think would solve what I want. But if there's a way to add it artificially into a chart, then I don't need to waste space to add 0 value records and reprocess my data I have already done.