GraphQL API - Publish to all channels?

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Hey all, pretty simple question:

Is there a way to publish to all sales channels/mark a product as "all channels available" upon creation?

I know that setting `published: true` on the item level makes the product available on the Online Store, but it doesn't publish it to all channels at once. 

What's the best/easiest way to do this via the GraphQL API / Product Mutations?