I understand that the solution I seek requires using the scripting function of mp3tag. I am not proficient in using that method. Is there a way to do that with Action or can you guide me on executing the intended function?
As far as I can see the linked post mentions an action of the type "Format value" to copy ARTIST to ALBUMARTIST. No scripting.
In your case I assume instead of ALBUMARTIST use DISPLAY ARTIST.
Please note that "DISPLAY ARTIST" is a user-defined and no standard field.
Problem has been solved. Thank you for your guidance.
Solution:
Create a preset titled "produce DISPLAY ARTIST"
Using Action function, create a new preset and use format value
Input Field = DISPLAY ARTIST [where you want to paste]
Input format string = %artist% [what you want to copy]
Click OK
Musicbee utilizes this DISPLAY ARTIST field by having you show [Calvin Harris, Alesso, Hurts] while having the ARTIST field display [Calvin Harris/Alesso/Hurts]