Product Bundle under standalone listing ASIN

Hi,

I have two standalone listings of separate ASIN’s. I want to use my existing FBA inventory
and sell the two products together to complement each other without creating a new listing.

So for example. If I sell apples and bananas and I have 2 seprate listings, I would like to add apple+banana as 1 product/selection under the banana ASIN standalone listing and do the same for the apple ASIN standalone. Not sure could be a variation trick to it. You can do it i think if you are brand registered using Virtual product bundle which I dont have.

So I want to add more value per order and reduce fba fees.

Anyone can share how to do this?

Thanks