Work Time Calendar comes with a Timesheets gadget.
The gadget can be configured to show time based on a JQL and for a defined set of users or group. The shown time period can be selected from Current week, Last 2 weeks and Current month. When filling the JQL make sure to test it since invalid JQL results in an error.
You can get multi custom timesheets views on your JIRA dashboard by adding a few gadgets with appropriate configurations.