How to put And and OR filter type when RetrieveMultiple query is Fetch Expression

Dear Experts,

Please advice how to filter CRM/Model Driven App Unified Client Interface View using below same query expression in RetrieveMultiple plugin when input parameter query is of type Fetch Expression:

FilterExpression filter = new FilterExpression(LogicalOperator.Or);

string[] sourceChannel = new string[] { "Central Bank", "AECB" };

FilterExpression filter1 = new FilterExpression(LogicalOperator.And);
filter1.Conditions.Add(new ConditionExpression("sourcechannelidname", ConditionOperator.NotIn, sourceChannel));
filter1.Conditions.Add(new ConditionExpression("casetypecode", ConditionOperator.Equal, 1));

FilterExpression filter2 = new FilterExpression(LogicalOperator.And);
filter2.Conditions.Add(new ConditionExpression("sourcechannelidname", ConditionOperator.In, sourceChannel));
filter2.Conditions.Add(new ConditionExpression("valid", ConditionOperator.Equal, 1));
filter2.Conditions.Add(new ConditionExpression("casetypecode", ConditionOperator.Equal, 1));

FilterExpression filter3 = new FilterExpression(LogicalOperator.And);
filter3.Conditions.Add(new ConditionExpression("sourcechannelidname", ConditionOperator.In, sourceChannel));
filter3.Conditions.Add(new ConditionExpression("valid", ConditionOperator.Equal, 2));
filter3.Conditions.Add(new ConditionExpression("reopeningcount", ConditionOperator.GreaterThan, 0));
filter3.Conditions.Add(new ConditionExpression("casetypecode", ConditionOperator.Equal, 1));

FilterExpression filter4 = new FilterExpression(LogicalOperator.And);
filter4.Conditions.Add(new ConditionExpression("sourcechannelidname", ConditionOperator.In, sourceChannel));
filter4.Conditions.Add(new ConditionExpression("valid", ConditionOperator.Equal, 2));
filter4.Conditions.Add(new ConditionExpression("statecode", ConditionOperator.NotEqual, 0));
filter4.Conditions.Add(new ConditionExpression("casetypecode", ConditionOperator.Equal, 1));

filter.AddFilter(filter1);
filter.AddFilter(filter2);
filter.AddFilter(filter3);
filter.AddFilter(filter4);

qe.Criteria.AddFilter(filter);

I tried below by taking help from Microsoft documentation as described here:

https://docs.microsoft.com/en-us/powerapps/developer/data-platform/org-service/samples/modify-query-preoperation-stage

But I don't have any idea how to put And and OR filter type in below XML Document.

Any help or guidance would be appreciated a lot.

entityElement.Add(
new XElement("filter",
new XElement("condition",
new XAttribute("attribute", "sourcechannelidname"),
new XAttribute("operator", "not-in"), //not equal
new XElement("value",
new XText("Central Bank")
),
new XElement("value",
new XText("AECB")
)
),
new XElement("condition",
new XAttribute("attribute", "casetypecode"),
new XAttribute("operator", "eq"), //equal
new XAttribute("value", "1"), //Complaints
)
)
);