Assuming you mean the sort order within your SharePoint List itself and not within Power Automate - one way would be to add a Calculated Column and set the formula to:
//Assuming your field display name is Employee Name
=IF([Employee Name]="Mr XXX","ZZZZ",[Employee Name])

Then in your main view, set the Order by your Order field.

An example of what the List would look like:

If that's not what you meant, then let us know.
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