Hi Banu,
It is easy and simple.
Follow below steps:
1. Create a calculated field and provide a fixed value from field.
2. Now add the calculative field into filter and show data points.
or
2. Add a parameter with the created field and add to sheet.
3. Now only those values from the fixed or default value would be shown.
4. Now make chart with other fields as usual.
Hope this helps you.