Is it possible to include a custom search command in your app as a calculated field? One that would automatically appear as part of Verbose search results?
From what I have seen/read it looks like a custom command has to be used as part of the stream of search commands, and is never an extension of eval which is what I think would be required to accomplish above.
Trying to decide whether to invest time in a custom search command vs just using a macro.
I am confused by what you are asking. The fields that appear on the left-hand side of Verbose search results are fields extracted at search-time. Those are most often set in props.conf of an app.
So are you asking for help with a search-time calculated field or do you mean an actual custom search (SPL) command? The latter can be included in an app, but takes a few steps.