How to add my app into marketing automation flow as an action?

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Hi There!
I am considering send a mobile push notification when customers abandoned their cart.

1, I already found that there is a abandoned cart trigger in marketing automation.
2. My app has a push notification action on SHOPIFY FLOW[not on marketing automation]

So if my push notification action shows in trigger in MARKETING AUTOMATION FLOW, it would be really helpful our merchants.

Thank you!

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