terms filter in json.facet

[gopikannan]

Hi,
  In normal facet request below can be used to filter the facet terms. I am
not able to do the same using json.facet. Please let me know whether I can
raise a JIRA for this. Checked the code and I think I can work on the
changes to support this.

facet.field={!terms='alfa,betta,with\,with\',with space'}symbol

https://lucene.apache.org/solr/guide/6_6/faceting.html

Thanks
Gopi