[NTG-context] circled number for item head

Dear all, I'd like to use circled number for item head. I found one method which use a counter as follows: \def\circlednum#1{\uchar{36}{95+#1}} \defineconversion[myitem][\circlednum] \starttext \startitemize[myitem, pack] \item 111 \item 222 \item 333 \item 444 \item 555 \stopitemize \stoptext But it has a limitation of numbers. I think that there is a better way for this like using overlay something, I guess. Is there any general method which is good for any letter? Thanks for reading. Best regards, Dalyoung