Ah, i see.
Battled with a similar problem myself a few years ago with the same API. My solution was, rather than store the QR code, i simply recreate it each time it needed to be displayed.
So an image link became like this:
<img dmx-bind:src="'https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=https://mysite.com/admin/ticketdetail.php?basket_id='+serverconnect1.data.query[0].basket_id" class="img-fluid img-thumbnail">
I played about with variants of this but never got it to work