SQL using GROUP BY with ROLLUP

I am using a SQL statement to display records with totals.
Is there a way to replace the NULL value on the summarised lines with some
text?

Example:

Part Date Qty
abc 06/01/2024 10
abc - 10
- - 10

Select Part, Date, sum(qty) from lib.table
group by Part, Date with rollup
order by Part, Date

With a bit more complex of a report, the NULLS make it difficult to see the
total lines. I would like to replace the NULL with a text description like
TOTAL.

Can this be done?

TIA, Darryl Freinkel.