We currently support a fixed set of things in ExecuteUpdate setters - regular columns, table-splitting complex types, JSON scalar properties, JSON complex types. It's impossible for providers to add support for their own setter types.

This is specifically a problem for PostgreSQL in npgsql/efcore.pg#3622, where scalar collections are mapped to PG arrays, which require special handling:

context.Blogs.ExecuteUpdateAsync(s => s.SetProperty(b => b.Tags[0], "foo")