refactor: remove redundant export code

[lechnerc77]

Purpose

• Reafactor file import code to avoid copy&paste of code
• Centralize logic for import block creation

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[X] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Test the code via automated test

make test

• Additional test steps

Execute import via file

What to Check

Verify that the following are valid:

• Automated tests are executed successfully

• Import via file works without regression

Other Information

n/a

Checklist for reviewer

The following organizational tasks must be completed before merging this PR:

• The PR is assigned to the Project board and a status is set (typically "in review").
• The PR has the matching labels assigned to it.
• The PR has a milestone assigned to it.
• If the PR closes an issue, the issue is referenced.
• Possible follow-up issues are created and linked.