shopify app import-custom-data-definitions is now available in Shopify CLI version 3.89.
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/migrate-metafields-with-shopify-app-import-custom-data-definitions
This is a companion discussion topic for the original entry at https://shopify.dev/changelog/migrate-metafields-with-shopify-app-import-custom-data-definitions