your case is very strong. Ask help letter from

your university including such sentences:

The personnel policy of **** University requires that all appointments be made on a year to year basis, whether primarily designated for research or teaching.
However, multi-year funded research positions such as that held by Dr. _____________that have historically received continuing funding from year to year), are considered permanent by the university.

The position held by Dr. ______________has continuing funding and is considered by the university to be a permanent position.