if you don't want to use metapost you can also use svg for background
for example:

\startuniqueMPgraphic{centered_svg}
  draw lmt_svg [
    filename = "badge.svg",
    width  = OverlayWidth,
    y      = OverlayHeight/2,  ] ;
\stopuniqueMPgraphic

\defineoverlay
  [svgback]
  [\useMPgraphic{centered_svg}]

\defineframed[Sback][location=low,background=svgback,frame=off,offset=8pt]

\starttext
this is a sample \Sback{1} text
\stoptext

On Mon, May 27, 2024 at 12:38 AM Kip Warner <kip@thevertigo.com> wrote:
Hello list,

I would like to typeset a number in a circle. Nothing fancy. No special
colours, transforms, or complex metapost magic (which I am not familiar
with).

I have tried \circled{3} and \textcircled{3}, but ConTeXt does not
appear to recognize these commands. Any help appreciated.

--
Kip Warner
OpenPGP signed/encrypted mail preferred
https://www.thevertigo.com
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