Hi labrys,
By design, we can't get the Approval Status field in InfoPath.
As a workaround, you can create a workflow to copy the Approval Status to another field.
I tested with Both SharePoint 2013 and SharePoint 2016 and succeed in reproducing , it is a by-design behavior.
If you need more information, you can go to user voice and post about it.
Thank you for your understanding.
Best regards
Itch Sun
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