[exim] access to add'l vars in Exim+SpamAssassin?

other than,

    $spam_score
    $spam_score_int
    $spam_bar
    $spam_report

as doc'd @,

    http://www.exim.org/exim-html-4.63/doc/html/spec_html/ch40.html#id2681592

are 'other' SpamAssassin vars available to exim.conf?

e.g., can i 'get'/use "_REQD_" -- the Required # of hits for
classification as spam, as set in SA's local.cf?