You can do it in 2 different way
a) Get all groups of that specific user using below query
<#assign myGroups= rest("/groups/for/members/id/[user_id]").groups.group />
And search for that specific group if it exists.
b) Get all members of a group using the below query and check if that user exist in list
<#list restadmin("/groups/id/[group_id]/members?page_size=999").users.user as member>
<#if member.id?? && (member.id?number == user.id)>
<#assign show_module = true/>
I think option "a" will be better here.
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