如何从数据存储区查询值是否在go中的数组struct中

I have two structs

type Parent struct {
    Text string
    Childs []ChildValue
}

type ChildValue struct {
    Name  string
    Value int32  `json:"value" datastore:"value" validate:"required,min=1,max=5"`
}

The value in childValue can be from 1 to 5. I want to be able to filter if value in array is more than 2

query = query.Filter("childs.value =>", "2")

It there a simple way to do that?