Is there any way to mark problems as completed?

I have an interview where I am expected to code the solutions in Dart and I've been leetcoding for a couple of weeks now. The problem is that LeetCode doesn't support Dart, and therefore I'm unable to submit my solutions.

As a workaround, I write test files with a bunch of test cases, and I write a couple of different solutions there. It's not great, but I don't want to have to translate every issue from Dart to Java/JavaScript just to submit it to the platform.

I'd like to be able to mark a problem as completed as it would help me see what kinds of problems I practiced enough and where I lack experience.

It would be great for the Algorithm study plan, as well as for the company specific interview prep selections (for example Google).