How Magento validate products in cart for carts price rule and how to extract product from conditions_serialized column of the sale rules table?

I need to create an indexer for cart price rules.
I decided to iterate the values from sales_rules table and extract the products from conditions_serialized coloumn.

My indexer file is like below.i Will share the executeFull method only here

public function executeFull(){
    $this->connection->truncateTable(
        $this->getTable('salaesrule_product_reminder_index')
    );

    $salesRules = $this->ruleFactory->create()->getCollection()->addFieldToFilter('is_active', '1');;
    foreach ($salesRules as $salesRule) {
        
        $ruleId = $salesRule->getRuleId();
        $conditions = $salesRule->getConditionsSerialized();
        // Here i want to perform the insert task based on the product extract from above
    }
}

I am stuck here on extracting the $conditions return json and getting the product_id based on SKU.

Sample return json is something like below.

{
  "type":"Magento\SalesRule\Model\Rule\Condition\Combine",
  "attribute":null,
  "operator":null,
  "value":"1",
  "is_value_processed":null,
  "aggregator":"all",
  "conditions":[
   {
     "type":"Magento\SalesRule\Model\Rule\Condition\Product\Found",
     "attribute":null,"operator":null,
     "value":"1",
     "is_value_processed":null,
     "aggregator":"all",
     "conditions":[
       {
         "type":"Magento\SalesRule\Model\Rule\Condition\Product",
         "attribute":"sku",
         "operator":"==",
         "value":"16-02-07938, 16-02-07939, 16-02-08413",
         "is_value_processed":false,
         "attribute_scope":""
       }
     ]
   }
  ]
}

How magento do this kind of extraction on checking the cart rules against a product in cart? This kind of validation happen with produt Id or SKU?

Can anyone give me some insights on this question to proceed further?