multi-line-text-split-sample.json

{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "display": "=if(@currentField,'flex','none')",
    "flex-wrap": "wrap"
  },
  "children": [
    {
      "elmType": "div",
      "txtContent": "[$__item]",
      "forEach": "__item in split(@currentField,';')",
      "style": {
        "margin": "5px",
        "padding": "2px 5px",
        "border": "1px solid",
        "border-radius": "7px",
        "background-color": "=if([$__item]=='IT','pink','')"
      }
    }
  ]
}