Hi Crazy Dance
From the Formatting column with long text to multiple-line with word wrap site:
It is not recommended to use rich text fields with List Formatting.
And according to this Microsoft article, multi-line text column with enhanced rich text is not supported within JSON column formatting.
So I suggest you apply JSON formatting to plain text column.
If you want this by OOTB, I suggest you can raise a thread in the SharePoint feedback portal.
Hope this helps. Best Wishes.
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