Add values to "Group Picker" field via automation instead of replacing

Valentin R.

Hi there.
I have a custom "Group Picker (multiple groups)" field that is responsible for giving access to specific user groups based on a project component. I use automation rules to achieve this but I noticed that once several groups need to be added, automation simply overwrites the value in this field.

Is there a way to add value to this type of field instead of replacing it?
I know it's possible for "User Picker (multiple users)" field, but not for Group Pickier.

Valentin R.

This is what worked for me

{
"update": {
"customfield_10000": [{ "add": { "name":"group-name" } }]
}
}