Although you cannot select insights custom fields from the field picker, it is still possible to edit them using the advanced section.
Step-by-step guide
- Select the edit issue action
- In the advanced block add the following, substituting the name of the field for the name of your field
{
"fields": {
"My Reference Object (Multi Select)": [
{ "key": "TEST-17" }
],
"My Reference Object (Single Select)": [
{ "key": "TEST-18" }
]
}
}