there are coding conventions here https://kotlinlang.org/docs/reference/coding-conventions.html

What i actually meant was some style guides to be while reformatting the code. You can try the square java-code-styles first 😄

Yes, this coding convention is part of Kotlin plugin for Idea, you just should enable it to reformat code according Kotlin convention

So its basically there by default in Idea ?

Yes, this is a part of Kotlin Plugin for Idea that sheeped by default with Idea. but reformatting according official style guide is disabled by default, it has some known bugs