You can highlight all the knobs you want to share the LAF. Right click and create a script reference to them as a group.

then do:

const var allMyButtons = [ Content.getComponent(button1),
Content.getComponent(button2),
Content.getComponent(button3),
Content.getComponent(button4)
];

for (a in allMyButtons)
a.setLocalLookAndFeel(myLafFunction);

thats off the top of my head. I think that looks right.

You don't need to put this in a separate file, and at this stage it might just be making things more complicated for you.

Here's an example of creating two laf objects.

const myLaf = Content.createLocalLookAndFeel();

const myOtherLaf = Content.createLocalLookAndFeel();

Create a new local laf object for each knob design. They can all exist in the same js file as long as they have unique names.