
Hi @TantirigamaThilina-7057,
Per my research and testing, there is no JSON that can set character limits for multi-line text column values . However, you can use the following JSON to limit the number of characters displayed in the list:
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"txtContent": "=substring(@currentField, 0, 10) + ''"
}
My test result:
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