Canvas group fade using lerp

I am constrained in a current project demo (need to create for Monday) in that I cannot make use of any tweening libraries like DoTween or LeanTween.
I simply need to fade a canvas group object which I assume is possible using lerp.

Can anyone help?

Fading, simple and easy:

Smoothing movement between discrete values:

The code: Smooth movement - Pastebin.com