如何将bson.M元素列表合并到golang中的mongo中的单个bson.M中？(How do i combine list of bson.M elements into a single bson.M in mongo in golang?)

lstMap := make([]interface{}, 0)
lstMap = mongoOps.AddToBsonMap(lstMap, bson.M{"$inc": bson.M{"Google.ab.Value": 1}})
lstMap = mongoOps.AddToBsonMap(lstMap, bson.M{"$inc": bson.M{"Google.ab1.Value1": 1}})

func (o *MongoOps) AddToBsonMap(lstMap []interface{}, value interface{}) (result []interface{}) {
lstMap = append(lstMap, value)
return lstMap

}

 I want the in this format :
 bson.M{"$inc": bson.M{"Google.ab.Value": 1, "AB.Value.to": 2}}

All the operation of same key needs to be appended.Thank you in advance