getTokenName(argsMap: StringVariationArgsMap): string {
    return convertToTokenName(
      getTextFromFbtNodeTree(
        this,
        argsMap,
        this._getSubjectNode(),
        this._getElementNode().options.preserveWhitespace,
        (_, child) => child.getText(argsMap),
      ),
    );
  }
Returns the text of this FbtNode in a "token name" format.
Note: it's prefixed by `=` to differentiate normal token names from implicit param nodes.

E.g. `=Hello [name]`