Is there a way to show msg.sender and gas usage for each sub trace?

[Confucian-e]

No description provided.

[zemse]

You can try using the showAddresses config. It includes the address of the current contract next to it's name. While the gasCost is not accurate I think.

export default {
    ...
    tracer: {
        showAddresses: true,
        gasCost: true,
    }
}