I am trying to build an instance_name that includes an image like the example below..
https://community.esri.com/t5/arcgis-survey123-blog/understanding-the-instance-name-setting/bc-p/898008

instance_name:
concat(:warning:, "<b>Subregion:</b> ", ${subregion}, " ", "Circuit: ", ${circuit}, " ", "Span From: ", ${span_from}, " ", "Span To: ", ${span_to})
error:

I am not having much luck getting this to work. Are there any examples on how to do this?
Thanks!