Get value from data source

Hi,

I would like to present count of records in dashboard - like: "Count of records: #". I am using text component and I assume, there has to be some javascript code in expression property

# value can be retrieved from a data source.

Is there a way, how to do it? I found only posts related to get parameter values, but no info about getting data from datasource.

Could you please help?

Thank you
Magdalena