Like you, I use Support Hero on my website. I would like for my bot to offer a link that opens the Support Hero help center. Support Hero offers the following link to open their support widget:
We don’t support JS function calls onClick events.
On a side note - This is would be a bad experience for the customer, jumping from one tool to the other.
What I suggest is to provide a link to your support hero help centre (company.supporthero.io) or your hosted page inside the bot. In our bots, we are using the link to open help.collect.chat.