Section 5 of the Northern Ireland (Executive Formation and Exercise of Functions) Act 2018 provides for appointment functions of Northern Ireland Ministers in respect of a list of specified offices to be exercised by a Minister of the Crown during the current period while there is no Executive in Northern Ireland. Section 5 also permits additional entries to be added to the list of specified offices by regulations.
Link: The Northern Ireland (Ministerial Appointment Functions) (No. 2) Regulations 2019
Source: Legislation .gov.uk