Randomized chaining possible?

Hi, just got an A4 and loving it so far. Something that occurred to me that would be cool was if it were possible to setup 5-6 patterns and have the A4 randomly select the next pattern to play once it reaches the end of the current pattern.

I’ve looked thought the manual but didn’t see anything there. Is this possible or is there someway to achieve something similar? My goal is to create a bunch of patterns and use those to create a constantly varying backing track for me to practice improvisation on top of.

Got something that will send random program change messages?