One of the store bought brands that's suggested for the Moka Pot is Cafe Bustelo (yellow pack), so anything that's got a similar grind should be A-OK.

https://www.cafebustelo.com/en/coffee/recipes/cafecito

https://wolfewithane.com/secrets-of-the-moka-pot

"The grind of Cafe Bustelo is a bit coarser than an true espresso grind, but finer than standard grind: exactly what’s needed for a moka pot. The true expresso grind is too fine and can seep through the pores, clog the filter, cause incorrect pressure, result in muddy coffee and leave deposits that taste rancid."