Hi Juraj, I created a quick outline for a possible solution:
You can create a “Feedback” table. Link it to your Users and Link it to the Trainings table:
1. On the Trainings detail page have the Quick link at the bottom for the feedback table, use conditional visibility so that the users can only see this if the linked field (Users -> feedback) does not contain current user. (Edited: to change the filter option)
2. Set a “Created by field” using the linked field (users-> Feedback) on the Feedback table.
3. Use the Autofill formula for the Training -> Feedback field (Article on how to set up an Autofill:
https://support.stackerhq.com/hc/en-us/articles/4409799378835-Auto-filling-values-into-create-forms)
4. Place the Autofill URL into your Quick Links Widget