Can you get an axis value without defining a name

I'd like to find the equivalent to Input.GetKey but for an Axis. I want to read in current value of a particular axis without needing to have defined a name for that axis first. I don't see anything like this in the Input class, is it hidden away somewhere else or is that functionality not exposed?

Don't think this is possible - What is the usage?

Using two Input.GetKey, you should relatively easily be able to make the equivalent of Input.GetAxisRaw, and the you would only need to apply a little amount of smoothing of your choice.

That's the best I can come up with