Shadow outline should support color palette

[DavydeVries]

I noticed that you use in Tailwind UI (sign-in) the following class:
focus:shadow-outline-blue

Currently in TailwindCSS only support
.shadow-outline aka box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);

So I blindly though that the color palette was generating shadow-outline classes with de specific color.
In my case I have a custom color palette:

"green": "#4caf50",
"green-50": "#e8f5e9",
"green-100": "#c8e6c9",
...

I expected that it would be generating:

shadow-outline-green
shadow-outline-green-50
shadow-outline-green-100
...

I know that I can extend the theme with customisation. But I have to add every color manually.