add computed twig in custom composite

I tried webform calculation fields insert to custom composite.
https://www.drupal.org/project/calculation_fields →

so error shows,
Warning: Undefined array key "#webform_parent_key" in _webform_entity_element_validate_rendering_error_handler() (line 1138 of modules/webform/webform.module).
_webform_entity_element_validate_rendering_error_handler(2, 'Undefined array key "#webform_parent_key"',
...
...
etc.

Currently it seems impossible to accomplish this goal of calculating each row in a custom composite.

Computed twig elements have performance limitations via Ajax. Any additional support should be handled via custom code or dedicated contributed module.