Since Django 5.2.

from django import forms
from django.forms import Script


class CalendarWidget(forms.TextInput):
    class Media:
        css = {"all": ("pretty.css",)}
        js = (Script("animations.js", **{"defer": True}), "actions.js")

renders to:

<script defer src="https://myserver.com/static/animations.js">/script>

https://docs.djangoproject.com/en/5.2/topics/forms/media/#paths-as-objects