Update Assignee and Due Date of specific tasks in a run via API

[ModestTG]

My company is trying to leverage MatterMost to automate our internal processes via playbooks. Ensuring that each step gets done. The issue is, as we create runs, the owners from run to run vary based on availability. So right now we need to manually update a playbook run containing about 70 tasks with the proper owners each time. We are trying to automate this process, but we need the ability to update the Assignee and Due Dates of tasks based on the current situation.

Looking through the Golang driver, I don't see any method that allows this functionality. I see func (*PlaybookRunService) UpdateStatus exists, but a general func (*PlaybookRunService) UpdateChecklistItem(ctx context.Context, playbookRunID string, checklist Checklist, checklistItem ChecklistItem) error doesn't seem to exist. Does this functionality exist at all?