Data for custom chain

How can I get data of DEX trade from the custom chain? Is it only possible with predefined EVM chains you mentioned? Or can I do that with putting chain id and contract address somewhere to fetch the data?
A quick help would be very much appreciated!

What is the custom chain you’re referring to?

Custom chain as any new chain which is not listed(or supported in bitquery). Can I do something like specify the chainId and contract address and get the data from it.