How to: multiple pools encapsulation

[astrometrics]

Hi,
I'm trying to create a function that initializes multiple pools with different technologies, with initialized pools identified by names and inserted into a BTreeMap. Another function should then provide a specific pool from technology and pool name parameters... I'm having some trouble trying to figure out how to define a function header to return a pool (tokio implementation); I tried many combinations but none worked. Can you please help me with that? thanks.