Search Slicer Box 508 Compliance

Hello,

I've developed a report in Power BI that contains some very large data sets.  To drill this down, I have implmented numerous search slicers into the report.  The problem kicks in with this report needing to be 508 compliant. For some reason, I cannot go into to search slicers by hitting enter, like all the other slicers. I have to click on them. I can make them keyboard accessable by going the dropdown route, but in some cases that would be millions of unique instances, and wildly cumbersome to use. How can I make the search slicer box keyboard accsessable?