Whether we can play PLAYERUNKNOWN’S BATTLEGROUNDS in Minecraft by using some plugins?Is there the plugin for sponge?If not,hope someone can make it.And it is best to connect with Flan’s.

No such plugin exists, so you would be best served in #plugins:plugin-requests. In fact the current plugin competition’s theme is minigames, so right now is the best time to request one. When you do so, make sure you distinguish whether you want a plugin themed specifically after PUBG, or whether you just want a generic battle royale plugin.
Also, unless I’m missing something, a plugin wouldn’t need to actually integrate with Flan’s. You would just put the correct item IDs in whatever loot configuration such a plugin would have, and Sponge should take care of determining who killed who when automatically.