collation definition with extension does not appear in the schema.rb

Hello,

when I add a `collation` with an extension to a migration it does not appear in the `schema.rb`.
https://edgeguides.rubyonrails.org/active_record_migrations.html#column-modifiers

For example:
`add_column :careflex_employees, :last_name, :string, collation: 'de-u-ks-level2'`, then the migration works fine and the column is created with the correct collation, but we need it in the schema.rb too.