How to .add() item to the list which contains column with LookupValue data type?

Hello,
I have two different lists but on both i am using the same Lookup Control (the same datasource) which has set property "saveTo" so saveing "New" form they store data in one of the list columns.

The question is how to save Lookup Data in both lists while filling one form, using pnp.sp.web....add(item)

How this item object should be prepared before sending add request?

PS. If this has a meaning, this is SkarePoin Lookup field not plumsail control.

Hey @szymanskicode,

Check if this helps: List Items - PnP/PnPjs