Concat the XML array value in logstash

HI magnus,
Actually im getting empty value on that field instead of that i want to get the repeated value in the array . For example,

you can find the field "ChannelCode" thrice in above my example, i want to capture all the three value in to respective field. This is what i want to do it.

currently getting
user_call_mode :[]
Expected Result
user_call_mode:"Day|Evening|Cell"