Table Sorter sort by span title?

I'm using table sorter plugin to sort a table on my website.

One column has only unsortable signs as content. However I'm trying to sort this column by value.

It's the column IMDb here: https://flimmerzimmer.eu/filmothek/

So I added span title to the span with corresponding value but it's not sortable.

Any ideas how to sort this column?

Topic table sort Wordpress

Category Web

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