Hi Saifuddin,
Why would you use an In-Memory database to store your BIP metadata/configuration? Why not using another server for that? All the hard work will probably be done by HANA anyhow.
As far as I can know there won't be much performance improvement by installing your BIP on top of HANA either way so it looks like a waste of the HANA RAM.
BRs,
Lucas de Oliveira