Save an array in OPC-UA Server structure

I want to create an opc-ua server structure. I used the package'node-red-contrib-iiot-opcua' : I used OPC_iiot_Server node to create the server and OPC_iiot_ASO to create the folder 'Test1' and the variable 'Torque' under the same folder. I want to save an array in 'Torque' but I don't know what kind of ObjectType and DataType I have to assign. As a test, I have assigned ObjectType = BaseVariableType; Datatype = String; Value = '[1,2,3,4]' and I've read correctly from the client represented by UA Expert; but what should I do if I want to save an array of integers? In the DataType field I can't find the array type.
This is my flow:

Thank you in advance

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