You have 10 activities. If you list 10, the colleges know it’s fluff. They want depth.
My point is - list the 3 jobs separately because they are three - and if dates overlap, they’ll understand the hours worked at a time.
That leaves you 7 slots for other activities - and there’s no way you could have done 7 other activities with depth.
Don’t break the rules. That’s just a reason to see that someone doesn’t follow instructions.
Stick to the plan - and show the skills that you learned at these jobs (customer service in a time of covid, etc., dealing with unruly people, etc.) and have a great app.