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is it okay to upload url of enemies data in notepad in game description page? 

You mean like a beastiary? Yeah, that's fine, since you're not altering the game's files.

no its actually enemy data in json format to fix the difficulty of the enemy due to the malfunctioning function of "Abort Battle" feature in my RMMZ game project. It is malfunctioning because in conflict with a certain plugin i use in my project. I just want to link the Enemies json file (in description or comment)  for downloaders to patch the game. Is it allowed?

As long as you aren't altering the main download, the one you submitted, you're fine. The judges will only play that download, not any addendum or other files on your page. The only way you'll get DQ'd is if you manage to change those submission files. Adding additional links for players who aren't the Judges is fine. :-)