How can I put Variables in URL's using django-qr-code

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I've been trying to generate URL's on a detailpage for my app. I want the url of the QR-Code to be a link to the detail page of the item. What i have right now is this:

<img src="{% qr_url_from_text "localhost:8000/items/{{item.id}}" %}" alt="QR-Code for the item">

the Problem with this is, that i want to give item.id as part of the url. But it's not seen as variable, so when i scan the qr-code, it opens the page http://localhost:8000/items/{{item.id}}, but i want it to have the actual id (e.g. 4) in the url, not {{item.id}} as string.

Is there any way to put variables in those URL names?

Thank you already

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