Is there a way to specify fixed arguments for a 2D line chart?

For example, my data looks like:

| Customer   |  Month     |     Sales       |
  ABC              1                   145.56
  ABC              2                    56.67
  ABC              3                    13.66
  XYZ               1                    45.67
  NMP              2                    67.75

I want my chart, on the X-axis, to always display months 1, 2, 3.

But, if on the data source I filter by customer XYZ, for example, on my x-axis I will only get data for month 1 displayed. Instead, I want to see months 1, 2, 3, but have the values be 0 on the months for which there is no record for that customer. The problem is, I can't easily add records with 0 values to my data.

So is there anyway to specify a fixed range of arguments for the x-axis on the chart?

Thanks