How to create a hive file from an existing database?

**Is your feature request related to a problem? Please describe.**
Hello, I currently have a sqlite database file. How do I convert that into a format that Hive understands?
**Describe the solution you'd like**
I understand Hive supports reading from an existing asset file. I don't know in what format/how I should store my table data for Hive to retrieve it.
**Describe alternatives you've considered**
I'm presently using sqflite to implement a read only database for my app, but sqflite doesn't support the web and I'm looking to hive to store my read only database for building the same app for the web.
**Version**
- Platform: Web
- Flutter version: [e.g. 1.5.4]
- Hive version: [e.g. 0.5.0]