Lisa as a tool provides predefined Assertions which can be used as per the requirement. In case custom assertion is required, scripted assertion or Java Script are the options.
Although the same assertion can be used by multiple teams which means rewriting the same code over and over again. This document talks about a more optimized solution to the problem stated above wherein we create a Custom Assertion and deploy it as part of tool.
Benefits:
manpreet.singh2 As per your suggestion, attaching the document.
P.S. Document for Custom Filter : LISA SDK: Create Your Own Filter