HEIC graphics format is nowadays supported in many graphics editor, even the default Windows Paint format supports saving to .heif/heic files. Which means that saving JPEGs to HEIC format (which is what jpeg to heic conversion pretty much is) should not really be difficult, but in case of heavily compressed pictures it does not make much sense. Quality will remain the same, while the file size will most likely increase.
Updated: October 31, 2023