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As far as I know, this is a not a built-in function of Alteryx.
However, I happen to handle this with a Macro.
Using Rand() function, you can have a number between 0 and 1.
You can use an Iterative Macro to "force" your Rand() function to fall between 0 and 0.8 (test it as many iterations as possible so it just outputs the result if it is in this interval) and then add 5.5 (as it's your starting point).
You basically get the same effect you're trying to produce.
Here's an example of how I would do it. Package with Macro appended.