Hi @sbdev –
As this appears to be a validation function, the owner would be the validation object.
https://shopify.dev/docs/api/admin-graphql/2024-04/queries/validation
https://shopify.dev/docs/api/admin-graphql/2024-04/mutations/validationCreate
https://shopify.dev/docs/api/admin-graphql/2024-04/mutations/validationUpdate
If you create a UI extension for your validation, you can add the metafield within that as well.
-Nick