Support for HEIC files

I got some photos in HEIC format (which appears to be common in the Apple world) and ... nothing I had on my notebook could open them. GIMP seems to happily handle those. eog (GNOME image viewer) and magick (ImageMagick) - no luck. libheif1-1.10.0-11.1.x86_64 is installed on this Tumbleweed system. -> How do we get eog to process HEIC images? -> How do we get magick to process HEIC images? -> Corollary: is there some other tool that converts those to JPEG/PNG? Thank you, Gerald