Is there a feature to block a player in your island?

so i found some people annoying to be in my island or spamming /is visit while i say no.
If there is a feature to completely lock an island (like only added players can enter but nobody more can request to visit) or block a player (automatically deny a request from certain players), they what's the command?

 

Take screenshots and report it on here in the spamming section.

Edit: I talked to her in-game and she said I could lock this thread now.