Is there a shorter syntax for transforming mutators?

[agladysh]

I find Arktype very useful in writing data adaptors, where my function has to accept arguments in several forms:

const $ = scope({
  input: 'string',

  params: {
    'trim': [ 'boolean', '=', false ],
  },

  // {{ bar | foo() }}, {{ bar | foo(trim=true) }}
  njk: [
    [ 'input' ], '|', [ 'input', 'params' ],
  ],

  // foo({ input: '', trim = true }), foo({ input })
  action: [ 'params', '&', { input: 'input' } ],
}).export();

export const regularParams = $.action;

export const njkParams = $.njk.pipe.try(
  ([ input, params = $.params({}) ]) => ({ input, ...params }),
  $.action
);

But this is a bit long-winded, as you can see.

Ideally I would like to write such a transformer right in my scope definition. Is it possible?