Hello @kr1!
Welcome to the Community!
Unfortunately there is not an endpoint that can be accessed from a spa for sending verification emails.
You can programmatically send it from a rule, many customers chose to do this when making verification required.
See this post:
If you would like to make a button that sends it, that would have to be done via a proxy API.
If you would like to leave our product team feedback on the topic that can be done here.
Thanks,
Dan