how to generate 300dpi images for printing on billboards IRL ?

Hello,

I'm a big fan of gemini nano banana, ive been playing around with google flow... but can't seem to get it to output a 300dpi image.

Any idea how to do this? I need to use one of the images I created for a 10 x 6 ft banner in real life, but it only outputs 96dpi.....

Any suggestions? Thanks!