You can create subscription emails in your account using Shopify's marketing automations.
Marketing automations allows you to create custom automations by creating templates and workflows to send emails to your subscribers when specific milestones or actions have been met.
These automations will be created on Shopify's Flow app, so before anything, make sure you have it installed.
The following page will open for you to start creating the worfklow:
Click on Select a trigger
You will see all the triggers with which you can start the workflow.
A trigger is an event that starts the workflow, where it can be something that happens inside your store or in an application, such as Sharpei Connect.
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For subscriptions emails, Shopify Flow works with 5 triggers: