How to change the start position of the "swipeBackEnabled" gesture

Yes it is indeed possible.

As example we take your swipe Event in TS:

swipeEvent($e) {
  $e.deltaX = -130;
}

Initialize this function and your card will be on the left.

EDIT: I misread your question I am sorry.
But what you can also do is in your HTML you add the swipeEvent as example like this:

HTML
<div (swipe)="swipeEvent($event)"><div>

TS

swipeEvent($e) {
  if ($e.deltaX <= 10) {
      //add swipe back code here
      };
}

If you swipe to the right and added the swipe back code then you should come to the page you were before and it will start more in the middle if you want to switch sides then just a minus infront of 10.