Edit existing intention in plugin

I'd like to make a very subtle change to an intnetion provided by the 'Javascript intention power pack'

Ctrl-J joins adjacent concatenated string literals into a single literal.

function f() {
  return "foo" + 'bar';
}

to

function f() {
  return "foobar";
}

I'd like to add a single space character the end of the word "foo "

Is this possible somehow???