Question About iOS how to modify the xnb file

[loserSyn]

I'm trying to beautify my Stardew Valley, but I have a problem: I'm on iOS version of Stardew Valley and I can't add mods or use content patches, so I can only accomplish my goal by modifying xnb files, but xnbcli doesn't support version 1.5 xnb files, is there any tool to unpack Stardew Valley 1.5?