Draw circle with fixed radius on geographic coordinates - Follow-up question

https://community.tibco.com/wiki/useful-geospatial-data-functions-spotfire

has a *.sfd file to draw circles. It says that "The circle must be added as a Feature Layer using the coordinate reference system EPSG:4326 - WGS84." however, is that true if the original coordinates of Lat/Long were in another coordinates system?

Also, how to plot the circles once I have generated the column? it is said to use a feature layer which I have try to do with no success. Do you have an example where the *sfd file is put to use to actually show circles on a map?

 

Thank you

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