extractText method
Extract text from a given cfi range
Implementation
Future<EpubTextExtractRes> extractText({
///start cfi
required startCfi,
///end cfi
required endCfi,
}) async {
final result = await _request('getTextFromCfi', [startCfi, endCfi]);
return EpubTextExtractRes.fromJson(Utils.asStringMap(result));
}