Configuration file to read xls

I've downloaded and installed the logstash-input-xls plugin. I'm wondering if there's now some sort of guide/documentation or something to follow which shows how to create a config file to read in xls and push it to elasticsearch? I've found resources online for csv etc. but I can't find anything for xls.
Like is there something like this page, but for xls?

I suggest you ask the (apparent) plugin vendor,

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