valid json

wrapper.py

@@ -1,5 +1,6 @@
 import argparse
 import logging
+import json
 import re
 import subprocess
 import threading
@@ -82,7 +83,9 @@ def relay_queue_input(
                         ),
                         "insertion": "/tellraw @p %s",
                     }
-                    command = "/tellraw @a {}\n".format(tellraw_params)
+                    command = "/tellraw @a {}\n".format(
+                        json.dumps(tellraw_params)
+                    )
                     log.debug("forwarding to process: {!r}".format(command))
                     process.send(command)
                 else: