Insert DB version into Sqlite like 1.0.1

I need to save the DB version into Sqlite like 1.0.1. The DB version will update from time to time. How could I insert DB version like 1.0.1 instead of an integer number?

await openDatabase(path, version: _version, onCreate: _onCreate);

Here I could see the version will be a nullable integer(int? version). How could I save something like 1.0.1 instead of an integer? Need help to achieve this.