I have a composite partition key in the cosmos db, but I do not understand how to get an item

List<(string, PartitionKey)> itemsToFind = new();
itemsToFind.Add(("testApi", new PartitionKey("["value1", "value2"]")));
var result = await container.ReadManyItemsAsync<MyClass>(items: itemsToFind);

It throws Number of components in the partition key value does not match the definition but how do I match the number if the PartitionKey accepts only a string?