Well, I have no immediate need; it was a suggestion for @barsamgr’s request.
For the format, I’d have to look at examples of the RSS files I’ve been using for an ecobee feed. I’ve been using two HA components: the Freedparser integration and the the List Card plugin.
https://community.home-assistant.io/t/lovelace-rss-feed-parser-plugin-list-card/64637/
In the meantime, here’s a link to a format template:
https://en.wikipedia.org/wiki/RSS#Example
I’m guessing the feed can be a local file. The location would be something like “/www/community/visonic/rss/file_name.xls” which would be referenced as “/local/community/visonic/rss/file_name.xls”.
Is the www directory exposed to the network via a non-routable local IP address (e.g. 172.x.x.x)? If so, a browser with an RSS add-on might be an easier and more elegant way to view the data. The Firefox add-on I use, Feedbro, keeps a running history of the feed, although I’ve been using the ATOM formatted content. I’m not sure RSS can do that by design, or if it’s a feature of the add-on.
I’m not sure what triggers a reload, but there is a mechanism for it. New content automatically replaces the last feed content, but the referenced URL for Feedparser and Feedbro is static.