In Scala 3.2, what's the most efficient method for eta-expanding a function or a class constructor with names and default argument(s)?

Question

During my involvement of an project that heavily relies on type-checked binding with Schematic data. I found many of the existing code share the following pattern:

case class Datum1(
  col1: String = "default",
  col2: Double = 0
  ... (over 40 columns)
)

case class Datum2(
  col1: String = "default",
  col2: Double = 0
  ... (over 40 columns)
)

case class Datum3
...

Obviously I would regard most of it as boilerplate, and ideally they should be rewritten to facilitate fast evolution of database schema. The closest implementation I could think of is:

case class SharedSchema(
  col1: String = "default",
  col2: Double = 0
  ... (over 40 columns)
)

case class Datum1(
  schema: SharedSchema
)

case class Datum2(
  schema: SharedSchema
)

case class Datum3
...

When the same call-site function Datum1(col2 = 1) is used, it should be rewritten into Datum1(SharedSchema(col2 = 1)) by the compiler.

I haven't seen any compiler feature or extension capable of doing this. What's the minimal work required to implement it?