Minecraft xbox 360 to bedrock

DLC for Minecraft works for Xbox 360 and Xbox one edition. it doesn't work for bedrock version.

So I think this page lays out what you need.

The problem is that you can't transfer a world directly from Xbox 360 Minecraft to the latest Bedrock edition of Minecraft. You need to transfer it through the Minecraft: Xbox One edition first.

The
details are laid out here

Basically you'll go from Minecraft: 360 Edition > Minecraft: Xbox One Edition > Minecraft (bedrock)

Let us know if you have problems or questions.

Both games are bedrock edition

I don’t own any other editions (Java, Xbox one, Xbox 360) for Minecraft

There are several different versions of minecraft. Minecraft: Java edition is PC only and can only crossplay with Java players (mac, Lenox, PC) The minecraft that doesnt have a version next to it is the play together version or more commonly called bedrock.
Bedrock is the version that can be played across mobile, console, and PC. There are also editions that are made specifically for most consoles and even a stand alone mobile version. Examples would be Minecraft: Xbox One Edition, Minecraft: Pocket Edition.
These do not work with Bedrock which is just called Minecraft. Java is the most updated version of minecraft while bedrock would be right behind that one. The others I'm really not sure how often they update them if at all. Each edition of Minecraft has to
be purchased separately. I happen to own both Minecraft: Xbox one edition and Minecraft since they released at separate times. I also have Java on my PC. As for your issue they do not have a Bedrock version on the 360.

Together with Mojang support I found out the problem why I do not manage to import my saved worlds on my Xbox One X in the online purchased version of Minecraft.

The Minecraft Xbox One version that you can buy online in the Microsoft store is a different version than the Minecraft Xbox One version you buy in the store (DVD). The online version is the so-called Minecraft (bedrock code base on xbox one) version.

To import the saved worlds, you first need to export the worlds on the Xbox 360 Minecraft version, import them into the Minecraft Xbox One Edtion import and then import old worlds into the Minecraft bedrock codebase version. (Minecraft Xbox 360 -> Minecraft
Xbox One Edtion -> Minecraft Xbox bedrock codebase).

You end up with a version that you do not use, but you can then sell it via e-bay to fellow gamers who have the same problem.

So it is possible and fortunately not as Microsoft indicated earlier that the worlds would be lost.