EXTRACTMENTIONS("Hey @channel, I have an urgent support issue that I need to address! @macguyver @RobertPaulson") :
@channel , @macguyver , @RobertPaulson (list)
EXTRACTMENTIONS( text-to-extract-from )
text-to-extract-from (any textual)
A list of Text values, with each value representing one mention. Note that each mention will still include its “@” sign at the front.