Theme app extension app_id

Retired Boards Appdev Customers Discounts And Orders
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hello guys,

I am developing an app, and it need to extract all metafields with the app namespace for product in a block.

My definition have a format

definition: {
  name: `Is Feature product`,
  namespace: `$app:custom`,
  key: `is_feature`,
  type: `boolean`,
  ownerType: `PRODUCT`,
  pin: true,
  access: {
    admin: `MERCHANT_READ_WRITE`,
    storefront: `PUBLIC_READ`
  }

And in my storefront, I have a block that get all the product and get the value with format

product.metafields.app--xxxxxxx--custom.is_feature.value

My question is how can I get the “xxxxxxx” (the app_id) to fill it in my liquid block. Thanks in advance.