AEM GraphQL nested AND and OR expression

@iamnjain I believe CF Model fields and Folder structure would really help in constructing the query. Also, please share any sample query that you must have tried

Sure @krati_garg 

Here is sample query

query SearchInFolder ($searchString:String!) {
questionandanswerList(filter:{
_path:{
_expressions: [
{
value:"/content/dam/testproject/contentfragments/qanda"
_operator:STARTS_WITH
}
]
}
_logOp: AND
question:{
_expressions: [
{
value: $search
_operator: CONTAINS
_ignoreCase: true
}
]
}
answer:{
_expressions: [
{
value: $search
_operator: CONTAINS
_ignoreCase: true
}
]
}
}
)
{
items {
question
answer
}
}
}

Here, the requirement is, It should search inside that folder AND should match the keyword either with question OR answer field. So It's an OR operation.

How to nest AND and OR operator in one single query?