When you create something on Pico-8, yes, you can export as ".p8" cartridge, or export to Windows/Linux/Mac executable, or even to a HTML5 page playable in browser.
However Image-To-Pico8 Converter is not a Pico-8 cartridge. It's written in C++/Allegro (and not in Lua) and it can be run only on Windows.
So no, i can't.