Support for structured append

[shobhitvaish]

Type of issue

Request for new feature/improvement

Expected Behavior

Thanks for the great library. It is easy to use.

Do you have any plan to support structured append?

[codebude]

Currently structured appends are not on my road map, because they would bring in major changes in the library. But feel free to kickstart an implementation and send in a MR/PR. If your solution matches the style/conventions of this project, I'm willingly to merge your future developments.