Example of CumulusCI add_picklist_entries Task as Flow Steps

add_picklist_entries_task.yml

5:
    task: add_picklist_entries
    options:
        picklists: npsp__DataImport__c.npsp__Status__c
        entries:
            - fullName: Ready To Process
            - fullName: Imported
            - fullName: Dry Run - Validated
            - fullName: Dry Run - Error
            - fullName: Failed
    ui_options:
        name: Update NPSP Data Import Status Picklist

6:
    task: add_picklist_entries
    options:
        picklists: npe01__OppPayment__c.npe01__Payment_Method__c
        entries:
            - fullName: ACH
    ui_options:
        name: Add ACH to Payment Method Picklist