Feh show custom text on image

I'm trying to find an example for feh image viewer that you can use to show on screen your custom text. I wrote my own application which is doing some action and one of them is to show on the image screen and upon the image some additional text is also displayed, which I get from a server response. All of the documentation that I found does not have enough information.

--info [flag]command_line
          Execute command_line and display its output in the bottom left 
          corner of the image. Can be used to display e.g. image dimensions or 
          EXIF information. Supports FORMAT SPECIFIERS. If flag is set to “;”, 
          the output will not be displayed by default, but has to be enabled 
          by the toggle_info key.

Does anyone have a command to show text as input or can also be read from a specified file.