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Open source Five Filters Full Text RSS can be self-hosted in a Docker container to retrieve full text from RSS articles
Chris did a nice breakdown of how this can work in conjunction with a self-hosted Fresh RSS reader (same as I'm using). It solves that issue with some RSS feeds only showing a short snippet of the content. I've also shared my own docker-compose file for this solution at https://pastebin.com/ARnUCpND where I've noted a workaround...