Integrating openai with pipedream, proper format for prior message history

I’m integrating openai with Gmail using pipedream. I’m trying to use the prior message history option, so that it’s a continuous conversation. What exactly do I write in the “Prior Message History” box?
I tried the following:
[{“role”:“user”,“content”:“Hello”},{“role”:“assistant”,“content”:“Hello! How can I assist you today?”}]
I receive the following error:

"Configuration error

The following message doesn’t have a “role” property:"
What am I doing wrong?