WP_Model-default.php

<?php
Class Product extends WP_Model
{
    public $postType = 'product';
    public $attributes = [
        'color',
        'weight',
    ];
  
    public $deafult = [
        'color' => 'blue',
    ];
}

$product1 = Product::insert([
    'color' => 'red'
]);

$product2 = Product::insert([
    'weight' => '100'
]);


echo $product1->color; // red
echo $product2->color; // blue