Try this
Add a few of your text files to calibre, fix up any titles and author names that need fixing, convert the txt files into whatever format you want to use on the Sony (e.g. ePub) and send those files to the Sony.
I think the conversion will create an opf in the book folder, which is actually irrelevant in this context.
The Calibre Send should embed an opf in the ePub from the data it has in the metadata database, even if it is sparse
Hopefully your Sony will find that more to its taste.
BR
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