add items to a syntax file as a vertical list?

I would like to edit the file syntax cpp.vim and include some new extensions to highlight. I would like to add these news extension as a vertical list, and not in the same line.

The normal way:
syn keyword ITK a b c d e

The way that I would like to get, using a vertical list
syn keyword ITK
a
b
c
d
e

Is there any way to add a vertical list of items?

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