add json feature

[tuna2134]

Hello,

I am not sure if #183 is working, so I sent this Pull Requests. If you don't want it, you can close it.

[djc]

I'd prefer to do handle all redis features at once (similar to #183) instead of doing one at a time. Are you up for that?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.28%. Comparing base (8639d19) to head (fd6701b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #244   +/-   ##
=======================================
  Coverage   81.28%   81.28%           
=======================================
  Files           6        6           
  Lines         668      668           
=======================================
  Hits          543      543           
  Misses        125      125           

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[tuna2134]

Okay, I'll do it