Hello Sonal,
It looks like the issue is [ char is the issue try without [ to see if is working.
If is not working please try the row command like in this movie:
I am able to get an expected results using other activities - Get Issue List Or Get Issue SQL Or HTTP Activity but exploring this activity to work as well- Search Issues using JQL.
I am passing as an input to JSON String - “project = TD AND issuetype = Service request”