Although Minecraft's Java and Bedrock Editions are quite different, it's still possible to convert an existing Java world to Bedrock if you don't mind there being some differences to the world ...

How to install tutorial worlds on Minecraft: Bedrock Edition Tutorial world TU46 in Bedrock Edition (Image via Mojang) Importing tutorial worlds for Bedrock Edition is a bit easier.

You can see chunk borders in Minecraft: Java Edition using wireframes, and in Bedrock by using coordinates.