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You can save stringstream data into a struct member using the << operator, just like you would with a regular stringstream. Here's an example:

struct MyStruct {
  std::stringstream data;
};

MyStruct myStruct;

myStruct.data << "Hello, world!\n";

Serial.println(myStruct.data.str().c_str());

In this example, we define a struct called MyStruct that has a data member that is a stringstream. We then create an instance of this struct called myStruct.

We then use the << operator to insert the string "Hello, world!\n" into the data member of myStruct. Note that we're using the c_str() function to convert the stringstream to a const char* that we can pass to Serial.println().

Finally, we call Serial.println() to print the contents of the data member of myStruct.