How to query block detail by block number in P-Chain?

[sylviahuang123]

Excuse me, I'm new to avalanche, would like to know something, thanks in advance.
Totally speaking, is there any solution to query block detail by block number at P-Chain, just like the method eth_getBlockByNumber at EVM?
If index API is the workaround, how can I decode the bytes to content human-readable, which from the response of index.getContainerByIndex
BTW, as below, enable indexer may result index incomplete? so I can't get complete data?
If --index-enabled is changed to false from true, AvalancheGo won't start as doing so would cause a previously complete index to become incomplete, unless the user explicitly says to do so with --index-allow-incomplete. This protects you from accidentally running with indexing disabled, after previously running with it enabled, which would result in an incomplete index.

[StephenButtolph]

The indexer is populated as the node syncs. So the indexer must be enabled when performing the full sync to avoid any incomplete indices.

[StephenButtolph]

See linked PR for example usage of the indexer for P-chain blocks.