Default value for repeatable custom field

Question

I am trying to set a default value for the repeatable custom field. My subform has a number field, a media field and a text field.
I am using the default value field in the repeatable field configuration like this :

And this is what I tried for the default value :

"type":"2","Fichier":"images\/blog\/test.jpg","Description":"Default description"

I am somehow not getting the syntax right or maybe not using the right approach for this.
My aim is to have values already filled with content when adding new subforms while editing the articles here :

Answer 1

So you would need to change it to be json and array based. Here is a rough example I setup as a default field which works as expected:

{"test0":{"type":"2","Fichier":"images\/joomla_black.png","Description":"assasa"}}

test0 is the in two parts, test is the name of the field and 0 is the field of the repeatable field.

the rest of it you can see matches similarly to what you have.