change location field in job record to filter category

[medarob]

In the job record there is a field location (probably for the town/city, like Berlin).

It's also possible to create a filter for the region (probably the country, like Germany).

The difference is, that you can't use the filter option for the location so it's not possible to show all jobs for a certain city.

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Is it possible to change the location field (in the job record) to a filter-able category like region?
With such a change it would be possible to filter for the city AND the country.
Otherwise you can probably use the region filter for the city/twon but then you can't filter by country.