This is not how this works and can be seen in the Thunderhub code.

Thunderhub will only make a request to Amboss for payments destined for a specific, hardcoded channel ID, not all payments through a node.

Here's the Thunderhub code seeking channel ID 1052673x257x257

https://github.com/apotdevin/thunderhub/compare/v0.13.27...v0.13.28