So, askrene (the routing oracle plugin) has support for layers, each containing information about channels (also, can add/remove channels and nodes, but that's mainly for special-effects for particular payments).

It would not be hard to import/export entire layers: I've speculated that LSPs or large players may want to issue "weather reports" which could be incorporated this way. There are two issues: 

1. Needs a standard format. This is easy, let's come up with something?
2. Privacy of those contributing to the data. This is hard, I don't know how to fuzz/exclude/delay data to avoid revealing the individual payments, but someone surely does? 

This is absolutely a service you could charge for, too. Perhaps a free version with very rough data, and a tier with more complete data?