Dashboard and JQL Query

[Carlos Flores Sour]

Good Morning reason of the question is the following:

I would like to know how by an JQL query and then with a Dashboard I can do the following information extract.

* "I want to build a gadget on a dashboard to show how many (as a count) bugs are associated to a user story".
* The structure that I have is that the bugs are created as sub-task of the user story (is the parent).
* Ideally is expecting to see something like:
User Story | Bugs "count" |
US-001  | 2
US-002 | 5
US-003 | 0
...   

I can't use rich filter since a restriction of the company.