Find Lightning node for channel creation based on amount and route
The mentioned lightning explorers show information from the gossip protocol which nodes usually have copied locally and provide to users. In clightning you can for example access that information with lightning-cli listchannels If I remember correctly  in lnd the command is lncli describegraph.
Gossip says a few meta data about what channels nodes accept. however in general a node cannot / will not guarantee that you will be able to route a payment of a particular size to node n (though in practisce it will most likely work)