Here is a sample script to show entire text in a column field:
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
"elmType": "div",
"txtContent": "@currentField",
"style": {
"white-space": "normal",
"padding": "10px 0"
}
}
However, it is not recommended to use Rich text fields with JSON formatting since they return their values with encoded HTML. You can turn off "Use enhanced rich text" under Edit column menu so that the column values will show as plain text.
Reference: Formatting column with long text to multiple-line with word wrap.
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