When do we anticipate the availability of custom code injection for email campaigns?

I just switched from free Mailchimp to paid Squarespace email campaigns because of trouble connecting my products to Mailchimp via Stripe / Square. The products wouldn't show up in Mailchimp, and Squarespace solved that problem.

Squarespace's product integration is streamlined, but I'd like more, custom control over font families, and the ability to embed other code into an email, say playlist embeds from one of the many music streaming services out there.

Let me know if this is not the place for asking about features that don't exist yet. I imagine the dev team will be on it, but just wanted to do better at bringing ideas to the table in the forums. Thanks.