Top 1,2,3 Product per Client

Hello.
I have two tables. One has Clients, each one with this unique ID (clientID)

Second table has transactions, each one with a unique ID (transID). The transaction table also has what client did the transaction.

The tables are related through ClientID.

I need to create a calculated column in my clients table that tells me the name of the product that each client spent more money overall.

Lets say this happens:

Client A:

• Bought 3x a tshirt for 5€. (15€)
• Bought 1x boots for 10€. (10€)

I would want the result to say tshirt.

Also, I need it to choose in some way in case of a draw.

If possible, I would need to get the product in second and third place.

Cheers.