sign the numbers manually you could use something like
\mark \markup \circle \concat {\with-color #white "." "9" \with-color #white
"."}
of course this can be refined or a markup function could be created.
Eluze
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Take a look at the following:
\set Score.markFormatter = #format-mark-numbers
s8
\mark #9 s8
\mark #10 s4
\set Score.markFormatter = #format-mark-circle-numbers
\mark #9 s8
\mark #10 s4
As you can see, when using circled numbered rehearsal m