Updated Notify_Custom_JSON (markdown)

Notify_Custom_JSON.md

@@ -76,6 +76,44 @@ The above would post a message such as:
 }
 ```
 
+You can also clear entries from showing by setting their values to being empty:
+```bash
+# Clear version and type from the payload:
+# Assuming our {hostname} is localhost
+# Assuming we want to clear both version and type from the output:
+apprise -vv -t "Test Message Title" -b "Test Message Body" \
+   "json://localhost/?:version&:type"
+```
+
+The above would post a message such as:
+```json
+{
+   "title": "Test Message Title",
+   "message": "Test Message Body"
+}
+```
+
+Finally, you can re-map values such as having the message go into a `body` tag instead:
+```bash
+# Add to the payload delivered to the remote server as if it was part
+# the prepared message Apprise would have otherwise put together
+#
+# Assuming our {hostname} is localhost
+# Assuming we want to remap the message section to body:
+apprise -vv -t "Test Message Title" -b "Test Message Body" \
+   "json://localhost/?:message=body"
+```
+
+The above would post a message such as:
+```json
+{
+   "version": "1.0",
+   "title": "Test Message Title",
+   "body": "Test Message Body",
+   "type": "info"
+}
+```
+
 ### Header Manipulation
 Some users may require special HTTP headers to be present when they post their data to their server.  This can be accomplished by just sticking a plus symbol (**+**) in front of any parameter you specify on your URL string.
 ```bash