It seems they won't announce publicly, rather they just contact winners through the respective channels provided in the terms and conditions. I actually saw someone on X asking Samsung India if the email they got saying they won the bonanza event is ...
Just a heads up, to use the PharmEasy voucher from the Samsung Wallet/Health bonus, you need to place the order through the PharmEasy banner directly inside the Samsung Health app (under Discover > Find Care) rather than the main PharmEasy app. It's ...