should i ask to train to be a food runner?

Hi! So a couple of weeks ago I got hired as a host at my job and i love it so far! I was able to pick everything up quickly (and even started training new host already l) and the restaurant is growing because they’re opening a new location on another side of town. The only this is that i’m super worried about hours. I had only 12 hours until I asked for more and they just hired even more for our location so we’re at 13 host for just our location alone.. I really wanna work full time over summer to save but that sounds impossible with how many people we have because there’s only 35 possible shifts a week that must be divided amongst the 13 host. However, my restaurant is actively hiring for food runners, which they don’t have an influx of. Another thing to note is that they hire people with no experience and teach them everything, so i don’t exactly need food running experience. I was wondering if it would be a good idea to explain to my boss that i want to work more to save for tuition next semester and if I could train to be a food runner but i’m scared it sounds like too forward since i’m new.