I am trying to check the box on the Salesforce page, but the problem is that the message you want contains more than 40 characters, so it does not fit in the flag label (maximum 40 characters)
I tried to add two custom fields over the checkbox, but the problem is that these fields, even if they are read only for the user, can edit the contents (text (255)) or cannot see them (formula (text)) in edit mode.
Is there a way to do this without creating a custom page and adding it to the page?

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