FINALLY SOLVED after 2 days: How to POST the right values via a (v-for) dynamically created checkbox form
Next up, GET request with a filter to just the current logged in user (should I continue to use nuxt asyncData method and context helpers for this? Or switch to fetch method?), figuring out how to redirect to new post URL after publishing (this.$router.push(???)....?), and how to style a select dropdown like checkboxes (or make checkboxes submit string values instead of boolean)??