By default, multiple line of text column with enhanced rich text is not supported with JSON formatting. JSON formatting is only available with multiple line of text column with plain text.
As a workaround, add a scroll for multiple line of text column with plain text by using below JSON codes.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column formatting.schema.json",
"debugMode": true,
"elmType": "div",
"children": [
{
"elmType": "div",
"txtContent": "@currentField",
"style": {
"padding":"11px 8px",
"max-height":"64px",
"overflow-y":"auto",
"align-items":"flex-start"
}
}
]
}
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