Sendgrid - Trigger email via webhook from non-zapier

I've done quite a bit of research but can't seem to find an answer on this. Sendgrid has great documentation on event webhooks that send information after an email send, but very little on inbound webhooks that point towards sendgrid to send an email.

This is the only article I could find - but it's uniquely centered around Zapier which I'd rather not use.

Does anyone have any resources on how I could use webhooks that point towards Sendgrid to trigger emails without using Zapier?

Thanks!

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