Here is what I did to get the Json Editor Plugin to appear in the Setup dialog box.
After doing a bit of work with Google, I found this page that describes the steps to install JsonEditorPlugin on 3.4.
After you have completed the first 6 steps, make sure that the elements of the Group by category are unchecked . After that, you can select the Json Editor Plugin to install from the local Zip archive that you downloaded from the network.
Edit: as a side note, you should not have the unzipped contents of the zip archive in the folder / folder, otherwise it will look as if the plug-in is already installed.
Just dropping the zip contents into the dropins folder also worked.
Note. You should right-click your .json file and select "Open with" โ "Json Editor"
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