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The String msg documentation shows that std_msgs/String has only data field.
"Message type
std_msgs/Stringdoes not have a fieldposition"
suggests that your program doesn't construct the ROS message like it should (with string in the data field of message).
When I did something similar, I have used this converter:
https://github.com/uos/rospy_message_converter
between JSON and ROS messages. Maybe you could use it to form everything correctly with similar steps - between MQTT and ROS: get MQTT message as string, loads it into JSON/Python dictionary, convert it to ROS message, publish. The only problem would be the ROS1 version used (I used it with Noetic).
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