Bedrock Dedicated Server (Alpha) allows you to play similarly to Realms but hosted by yourself. It means you can use it cross-platform between your Windows 10, Xbox One and others.
Unfortunately Nintendo Switch client can't connect to BDS because you can't manually add a server. But stay tuned I'll follow future releases. JAVA VERSION NOT COMPATIBLE, use other kind of server for that purpose.
This container run the latest version availabe on https://www.minecraft.net/en-us/download/server/bedrock/
docker run -d -p 19132:19132/udp --name bds scndel/minecraft-bedrock
TODO You can create volume to mount /bedrock (or LD_LIBRARY_PATH env) to your host path for persistence (in other words everthing you've achieved in the game that you could lose with the container) or to provide server.properties and other data files.