send a group text via android web interface without one-at-a-time recipient selection

[Android Central Question]

I want to use the web interface messages.android.com to send a group text. I don't want to have to add the recipients one by one. I have their numbers in a list which I could paste in, but there doesn't seem to be a separator that is recognised in the To: box. So if I paste in 01234567890,01234567891, it thinks it is all one number. I tried semi-colon, and line break also. I tried names instead of numbers. My fear is that this omission of functionality is by design. My hope is that it will be in the next release - or else that it can be done and I just haven't figured how?