Thanks to @max for bringing this post https://newsroom.social/notes/98eiag05ud by @astrid to my attention.

I removed the rounded corners and the border and removed the artifacts from the silhouette.
The image resolution isn't that high, but good enough for A4.
I uploaded a PDF to my Nextcloud:
https://cloud.nekover.se/s/S7QQmLesmPMS5kK