How do I declare a Delegate that holds a tuple?

I have a scenario where my methods can only accept 1 input parameter (Azure Durable Function Activity Trigger). To work around this, if I need multiple parameters, I stuff all my input values into a Tuple and then just pass the Tuple to the activity trigger.

Im trying to create a Tuple that holds 3 items

1. Item1 = Dictionary<string,string>
2. Item2 = Dictionary<string,string> MyFunction(T)
3. Item3 = T

• Item 1 is a Dictionary<string,string>
• Item 2 is a Function that accepts a generic-typed object T, and outputs a Dictionary<string,string>
• Item 3 is a generic-typed object T

Id like to be able to execute Item2, using Item3 as input. The execution of Item2 would produce a Dictionary that I will combine with Item 1.

The issue I'm having is that the declaration syntax of a delegate doesn't really fit into a Tuple declaration syntax.

Here's how I attempted to type the Tuple with a delegate (which throws errors and does not work)

        [FunctionName("MapOutputVariables")]
        public Dictionary<string,string> MapOutputVariables<T>(
        [ActivityTrigger] Tuple<Dictionary<string, string>, delegate Dictionary<string,string> map(T x), T> input, 
        ILogger log)
        { }

How would I go about correctly declaring the delegate within the tuple?

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