MessageAttributes in SNS filter

Hi, We are using the AWS opendata SNS arn to get the newest scenes when they are uploaded.

We are not interested in all scenes, only particular Tilegrids. Now with SNS we can filter on messageAttributes, so placing there a utmzone, latitude or grid would be great for users to not be having to process each new scene.

see here: Amazon SNS message filtering - Amazon Simple Notification Service

but the messageAttribute object of the SNS is empty. Why did sentinelhub choose to not make the SNS messages filterable? Thank you,