Hi @GunjanDe1 
 
Not sure, the version, where it is not working.
 
I have my local running on AEM 6.5.18, and the following query works fine:
 
query {
blogList(
includeVariations:true
){
items{
_variation
_path
title
}
}
}
 
 
Add as many fields under items., I just added bare minimum