@suvankar.chandra
you have to install the certificate to the katalon jre.
if you added the certificate to java inside C:\Programing files\Java\jdk or jre it won’t reflect in katalon studio
you have to add the certificate to the katalon installation location which is under the following path
C:\Users\your user name.katalon\packages\Katalon_Studio_Windows_64-8.6.6\Katalon_Studio_Windows_64-8.6.6\jre\lib\security
please refer to my workaround here