Here are some similar suggestions I identified on the current Roll20 Suggestions forum vote. If you like them, lend them a +1 vote too.
If one of them appears as a matching suggestion, you may choose to copy your Comment to the other thread, subtract your +1 vote from this thread to hide it, and add your +1 to the best-matching thread instead, so that the votes can climb higher together.
Index of some Suggestions regarding Layers and Invisibility
Could we have a Stealth layer in addition to the GM Layer that will only show the token to the player who has a high enough Perception roll to see it? (the current thread)
https://app.roll20.net/forum/post/1421474/could-we...Invisible Layer Only Player or GM can see
https://app.roll20.net/forum/post/1660460/invisibl...Multi-Layer Maps & Line of Sight
https://app.roll20.net/forum/post/1649267/multi-la...New Layer
https://app.roll20.net/forum/post/1321170/#post-13...Visibility Setting for all assets: Configure which players can see an asset (Stealth, Hallucinations, Perception, etc)
https://app.roll20.net/forum/post/1495573/visibili...Visible/Invisible Tokens and Objects
https://app.roll20.net/forum/post/1414336/visible-...Visible/Invisible to Specific Players
https://app.roll20.net/forum/post/1464355/visible-...Add a "seen by" drop down to Tokens.
https://app.roll20.net/forum/post/1458455/add-a-se...