LoyChatFillCommand is a PaperMC 1.21.8 plugin that lets administrators send clickable, color-formatted messages to players. When clicked, these messages automatically pre-fill the player’s chat bar with a predefined command or text, ready to edit or send.
Key features:

• Command: /chatfill <player> "<display message>" "<command/message>" "<hover text>" (yes, let the ")
  
  
• Supports color codes with & in both display and hover text
  
  
• Works from console or in-game (requires chatfill.use permission; OP by default)
  
  
• No configuration needed — works immediately after install
  
  
• Tested on PaperMC 1.21.8 (functionality on earlier versions not confirmed)
  
  
• Uses Paper’s Adventure API for interactive chat components

Use case: Perfect for quick interactive prompts, teleport requests, private messages, or any situation where players need to insert predefined text into their chat bar with a single click. I'm personnaly use them with other plugin like DeluxeMenu.