Often you can, but it depends on the holders and their size.

If it looks anything like I think it does, the holder slides off the camera back. By default, the holders take one glass plate each, but you can use film sheaths into which you slide your sheet of film, then the film and sheath slides into the holder. If you can't find any sheaths, but do have some old plates, you can use some low-tack glue (or jam!) to stick the sheet of film to the glass holder.

I use a 9x12cm plate camera. 9x12cm film is not that hard to find, and the modern 9x12cm holders also fit a standard 4x5" camera (the holders have the same external dimensions).