aklapper@phab1004:~$ cd /srv/phab/phabricator/
aklapper@phab1004:/srv/phab/phabricator$ sudo ./bin/config set projects.fields --stdin < /home/aklapper/T429866.json
Reading value from stdin...
 OVERRIDDEN  The configuration key "projects.fields" is already defined in the database. The value from the database will override the value in local storage.
 DONE  Wrote configuration key "projects.fields" to local storage (in file "conf/local/local.json").

aklapper@phab1004:/srv/phab/phabricator$ sudo ./bin/config get projects.fields
{
	"config": [
		{
			"key": "projects.fields",
			"source": "local",
			"value": null,
			"status": "unset",
			"errorInfo": null
		},
		{
			"key": "projects.fields",
			"source": "database",
			"value": {
				"std:project:internal:description": {
					"key": "std:project:internal:description",
					"disabled": false
				},
				"std:project:custom:repository": {
					"key": "std:project:custom:repository",
					"disabled": false
				},
				"std:project:sprint:start": {
					"key": "std:project:sprint:start",
					"disabled": false
				},
				"std:project:sprint:end": {
					"key": "std:project:sprint:end",
					"disabled": false
				},
				"isdc:sprint:startdate": {
					"key": "isdc:sprint:startdate",
					"disabled": false
				},
				"isdc:sprint:enddate": {
					"key": "isdc:sprint:enddate",
					"disabled": false
				},
				"isdc:sprint:issprint": {
					"key": "isdc:sprint:issprint",
					"disabled": false
				}
			},
			"status": "set",
			"errorInfo": null
		}
	]
}