No, you will not be able to delete your account from the app. You will have to call customer care at +1 (800) 634-4350 to have your account deleted (omronhealthcaresupport@omron). Please make sure to cancel the subscription plan you may have opted into on the app before requesting to delete your account.
If you are a premium user with active subscriptions, please make sure to cancel the subscription plan to avoid auto payment on each renewal. For cancellation, you need to visit the App store or the Google Play store to cancel the subscription.