I know that is possible to open my app (based on package name) in Google Play Store, but how to do same in Huawei AppGallery?
You can use the badge service provided by HUAWEI AppGallery to promote your app, including preparing materials for making a badge, configuring an app link, and obtaining referrer statistics. With the service, you can efficiently collect statistics on app downloads in AppGallery and provide the silent installation service for users to improve the promotion effect.
When a user taps your badge in a channel, the user is redirected to your app details page on AppGallery. The user can tap Install to automatically download and install your app.
Check the screenshot below: