Printer driver for Snow leopard

hp do not support older versions than macOS 10.15

HP ENVY Inspire 7224e All-in-One Printer Software and Driver Downloads | HP® Support

airprint was introduced with OS X 10.7 (Lion)

snow leopard is OS X 10.6

you can check if the guternberg printer drivers support your printer

Gutenprint Supported Printers

otherwise you're out of luck

Do you have access to a Windows 7 to 11 PC, or possibly a more modern Mac that works with this printer? If nothing else helps, you could perhaps try to print to PDF (save as PDF) on the Mac OS X 10.6 Snow Leopard iMac, and then transfer the PDF files (for example, on a USB flash drive) for printing.