Is it possible to get CPFP information from full node, without requesting full mempool dump? I want to get CPFP information out of full node - that is, ancestorsize and ancestorfees - in order to calculate the necessary fee for either CPFP, or RBF if possible.

Can I get this information through RPC without requesting the full mempool dump?

I need this to build tools for CPFP/RBF, that are connecting to full node via RPC. But I can only find the full mempool dump, which is inefficient for this (I don't need the full dump for one transaction information).
The answer is getmempoolentry.

https://chainquery.com/bitcoin-api/help/getmempoolentry