'IXmlSerializable with Interface

I'm having a list i'm trying deserialize. i not own IBaseIndicator object but it implement IXmlSerializable.

I just need 2 things to control serialization 1- overide root elementName 2-being able set the type as root attribut so i retrieve the type

for now i have this overide

 public void WriteXml(XmlWriter writer)
        {
            foreach (IBaseIndicator indicator in Indicators)
            {
                XmlRootAttribute xmlRootAttribute = new XmlRootAttribute();
                xmlRootAttribute.ElementName = nameof(IBaseIndicator);

            //how to insert this kind attribute ->    writer.WriteAttributeString("AssemblyQualifiedName", this.GetType().AssemblyQualifiedName);

                XmlSerializer xmlSerializer = new XmlSerializer(indicator.GetType(),xmlRootAttribute);
                xmlSerializer.Serialize(writer, indicator);
            
            }
        }

this just overide rootname but i like to get this with AssemblyQualifiedName attribute is it even possible ?

<IBaseIndicator AssemblyQualifiedName="NosIndicator.Ohlc.Ohlc, NosIndicators, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
c++sharpserializationdeserialization


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