Add Group picker field
Log in as a user with the 'Jira Administrators' global permission.
Navigate to Admin menu → Issues → Custom fields → Add custom field.
Click on the Advanced option in the left navigation bar and search for Advanced group picker fields (single or multi).
Fill in the name of the field and optional description.
Press Create to confirm.
Associate new field with appropriate screens and define a context.
Configure Group picker field
Log in as a user with the 'Jira Administrators' global permission.
Navigate to Admin menu → Issues → Custom fields → locate Group picker field.
Go to Actions → Configure.