Sources of such files are https://community.wanikani.com/t/so-much-vocab/12050, https://community.wanikani.com/t/Some-Supplemental-Material/8121, Shared Decks - AnkiWeb, https://wanikanitoanki.com
I wonder if there is a way to export to PDF or to rich text formatting?
Anyway, there is a way to export to a spreadsheet (Excel)…
That is, Export>>“Notes in Plain Text”. You will get a text file, but…
- You can copy the content to a spreadsheet (Excel / Google Sheet / Numbers)
- You can rename the extension from *.txt to *.csv or *.tsv
- A text / a spreadsheet can be easily manipulate by programming; for example, Python
- I really want to learn how to more powerfully manipulate a database…
You can import this later into things like Memrise, which supports bulk importing… (but not as perfect as Anki…)