SharePoint List - Custom Multi-Line Text Format

columnformat.json

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "display": "flex",
    "flex-direction": "column",
    "min-height": "40px",
    "max-height": "120px",
    "padding": "8px",
    "border-radius": "4px",
    "border": "1px solid #e0e0e0",
    "box-shadow": "0 1px 3px rgba(0,0,0,0.1)",
    "background-color": "#ffffff",
    "transition": "all 0.3s ease"
  },
  "attributes": {
    "class": "ms-fontColor-neutralPrimary"
  },
  "children": [
    {
      "elmType": "div",
      "style": {
        "overflow-y": "auto",
        "width": "100%",
        "padding-right": "4px",
        "line-height": "1.5",
        "font-size": "14px"
      },
      "txtContent": "@currentField",
      "attributes": {
        "title": "@currentField"
      }
    }
  ]
}