I am new using graphql API, so maybe what i am asking is something easy to do

i want to filter nested data in my schema this is my schema whit typeorm, everything is ok wit the relations and i know how to handle te N + 1 problem.

@ObjectType()
@Entity()
export class Product extends BaseEntity
{
    @Field()
    @PrimaryGeneratedColumn()
    Id_Product!: Number;

    @Field()
    @Colum()
    Name: String;

    @Field(() => [Product _Photo], { nullable: true })
    @OneToMany(() => Product _Photo, product_photo => product _photo .Photo)
    Product _Photo: Product _Product [];

    @Field(() => [Category], { nullable: true })
    @OneToMany(() => Category, category=> category.Category )
    Category: Category [];

    @Field()
    @CreateDateColumn()
    CreatedAt: Date;

    @Field()
    @CreateDateColumn()
    UpdateAt: Date;
}

so now to handle the one to many relation i need to make to field resolvers to fetch the data, this is my resolver

@Resolver(Product)
export class ProductResolver
{
    @FieldResolver(() => Product)
    async Product_Photo(@Root() Product: Product) 
    {
        return await Product_Photo.find({ Id_Product: Product.Id_Product});
    }

    @FieldResolver(() => Product)
    async Category(@Root() Product: Product) 
    {
        return await Category.find({ Id_Product: Product.Id_Product});
    }

    @Query(() => [Product], { nullable: true })
    async GetProduct(): Promise<Product[]>
    {
        // need to filter sort and paginate the product 

        // FILTER BY CATEGORY
        // Product.find().filter({ Category: ['Art', 'Food'] })
        return await Product.find();;
    }
}

so i can do a filter in javascript or whit typeorm, the problem is the category field is empty until the GetProduct query runs and in the filed resolver i only can get the category of one product, to filter the products by category i need to do it after field resolvers run, there is a way to do this?, if it is i can do a filter sort and paginate all the data and send the data perfectly.

if is not a way to get the data after all field resolvers run, how can i do this in another way ?, I don't want to run the one to many querys inside the GetProduct query i feel this can be done in a better way