Welcome to the forum @ShyamVadlamani 
This previous thread may help.
Client relevance to get computer group memberships - Content Authoring - BigFix Forum
I modified the relevance to also cater for the newer “Server” based groups.
Q: concatenation ", " of ((values of headers "subject" of relevant fixlets whose (value of header "X-Fixlet-Type" of it = "ComputerGroup") of sites);(following texts of firsts "__Group_0_" of names of settings whose (value of it = "True") of client);(following texts of firsts "__Group_1_" of names of settings whose (value of it = "True") of client))
A: Test Group - Automatic, Test Group - Manual, Test Group - Server, Windows - Workstation - Win11
T: 0.044 ms