[Feature Request] --zone-file support range with "Start Frame" and "End Frame"

Hello. Nice to see the new x265 option --zonefile. According to the note in code, each line in zonefile must be <frame number> <option>. However I believe there are a lot of people use --zones like: --zones startframe, endframe, option/startframe, endframe, option

So any idea changing ( or adding support to) this new option? In zonefile.txt each line should be : startframe endframe option