Link to a lookup a column by using json formatting

Walter Fuentes : Lookup field any way take you to the original list item from the current list item. It's by default gives link to the item in another list.

Even though following is the code I tried and it worked:

{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "a",
"txtContent": "@currentField.lookupValue",
"attributes": {
"href": {
"operator": "+",
"operands": [
"/sites/Test21/Lists/TestList/DispForm.aspx?ID=",
"@currentField.lookupId"
]
},
"target": "_blank"
},
"style": {
"color": "#796BB1",
"font-weight": "bold"
}
}