How can I access the paragraph fields from my node via Tokens?
The token browser stops spitting out chained suggestions after a sensible level of nesting - otherwise the memory use and (lack of) UI responsiveness could easily get out of hand. That doesn't mean that chaining stops, just the available hints.
You can keep right on going, e.g.
[node:field_agent_reference:entity:field_gratification_for_agents:entity:field_foo:value]