Sentinel Data Connector - connectorUiConfig - add own icon

Hi,

I've created an arm template to deploy my data connector to my workspace. I would like to use a custom icon and it looks like this is possible as 2 is shown as configurable. I can see from  other connectors it must be possible, but I can't get anything to work and can't find anything online.    I should be able to change it in connectorUiConfig section of my template.

Can anyone give me an idea of how to do it?