It would be very convenient for the user to add not only one Read More, but also N number of buttons for the entire text.
For example:
The first part of the text
"Read more"
The second part of the text
"Read more"
The third part of the text
"Read more"
Implement the ability for users to add a field when creating content. Adjust the twig template and FieldWidget
Needs review
1.0
Code
I added a button in the widget to create another "hidden" field, forming a tree. It would help to change the Item scheme to store data correctly.