Currently, it is not possible to add a shared content block as a related data field.
As far as I understand you would like to have a content which is the same for all your dynamic items. If so, what I can suggest is to create a dynamic module which will have a custom field of type LongText
and under the Interface widget for entering data
section please select it to be Rich text editor
. After that you can create an item of your dynamic module under the Content
tab and enter in the long text field the content which you would like to share.
Then, you will be able to add a custom related field and select it to be of your new module type.
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