Reformat payload data from mysql database

Question

I have a database that looks like this on MySQL Workbench: [mysql][1] [1]: https://i.stack.imgur.com/WQmTp.png

I created an endpoint in Spring that returns all records from above database:

@RequestMapping("/api/v1/")
public class ProductController {

    @Autowired
    private ProductRepository productRepository;

    // get all products
    @GetMapping("/products")
    public List<Product> getAllProducts() {
        return productRepository.findAll();
    }
}

Currently the endpoint returns JSON in this format:

[
{
"id": 1,
"name": "Brown Brim",
"price": 25,
"title": "Hats"
},
...
{
"id": 9,
"name": "Adidas NMD",
"price": 220,
"title": "Sneakers"
},
...
]

Just an array with all the data.

Is there a way to format it like this with a Java function?:

[
Hats: {"id":1, "name": "Brown Brim", "price":25},{... another product that is a hat},
Sneakers: {"id":9, "name": "Adidas NMD", "price": 220},{... more sneakers}
]

I want it to create an array of objects, where the object is identified by the "title" field and has the rest of values in an object inside.

Or do I need to change the database itself?

Thank you.