Is it possible to copy numeric field value using JIRA automation?

[Mykola Makhin]

I'm trying to create an automation that would set custom field "Story points number" to the value of built-in field "Estimate[Number]", using code like this:

{
  "fields": {
    "Story point estimate": {{issue.Estimate.asNumber}}
  }
}

But it doesn't work.

I've tried multiple variations, e.g.

{
  "fields": {
    "Story point estimate": {"id":"{{issue.Estimate[Number].asNumber}}"}
  }
}

But always end up with JSON parsing error ("Error while parsing additional fields. Not valid JSON.") or with an error saying value is not a number ("ES-341 (Specify a number for the custom field (below 100,000,000,000,000) (customfield_10016))")

I've tried different variations with and without [Number] part in field name, using {"id":"{{issue.Estimate.asNumber}}"} etc - nothing worked.

I'm also not sure why "Story point estimate" is a custom field - I didn't create it, it appeared after I enabled "Estimates" feature.

What I actually need to do is to copy story point estimates from existing "Estimate" field to this new field/