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This seems to be the dimmable counterpart;
https://redarrowtrading.com/dimmable-driver-for-sp6w.html
The LED Circular Panels are suitable for educational providers and residential areas, are supplied with fixed output as standard and dimmable drivers are available to order separately if required.
Suspect the answer is no, you can't use a dimmer unless you fit the above instead.
Got a soldering iron ? :)
I googled Red Arrow SP6W, they appear to be 6W circular panels that are dimmable.
Not sure if that's the type of light you have though or maybe these were left behind because they were not useful.