In reply to Giorgos Sarigiannidis.

I did something similar by allowing the Table of Contents block to be converted to a List block. I did consider allowing the entries to be edited in the ToC block itself, but I figured it would make things too complex and create a confusing UX where some entries would be linked to the text of their respective headings, but others wouldn't. I figured the explicit convert-to-List button was easier for users to understand and far less complex to implement.