Is your feature request related to a problem? Please describe.

I was trying to play with RSS feed for jobs. The feed gives the last 20 items. While going through one of the item inside the list, when I tried running:

# here feed is the list of job feed after parsing
>>> item = feed[0]
>>> item.keys()
dict_keys(['title', 'title_detail', 'links', 'link', 'summary', 'summary_detail', 'id', 'guidislink'])

It doesn't way a location or region.
It also does not have categories or even published(date).

Some other job feeds (WeWorkRemotely, StackOverflow, Remoteok etc) i played with had a field tags, location(StackOverflow did not have location while different sites used different name for it e.g. region or location) and published.

An example of it would be something like this:

>>> item.tags
`[{'term': 'ruby', 'scheme': None, 'label': None}, {'term': 'ruby-on-rails-4', 'scheme': None, 'label': None}, {'term': 'amazon-web-services', 'scheme': None, 'label': None}]`
>>> item.location
'Worldwide'
>>> item.published
'2020-09-29T05:00:59Z'

Describe the solution you'd like

For location, I think we can probably add this field as country, region and region is already available in the model here.

For tags, I think we can probably use the field job_types is also available inside the model here.

For the published date, I think we can subtract JOB_THRESHOLD_DAYS the field from expires.(or may be directly add this field to the model).

While having a brief look, from my limited understanding, I think adding functions for these in feeds.py should do the job.

If the feature seems reasonable, I would look forward to putting together a pull request for this.
If required, it would be great if someone could point to the other portions that I need to tinker with or keep in mind while making the change.