Rest Sensor API create dynamic channel names without default channel discovery

Hello,

i have following xml output to monitor:

<xyz>
<a>1</a>
<b>1</b>
<c>1</c>
<d>1</d>
[...]
</xyz>

so there are many channels.
I use the Rest Custom Sensor. If i select the standard "channel discovery" template i get "$["xyz"]["a"]" for example as the channel names. How should i configure the new rest template to create all channels only with name "a" without the additional characters $ [ ] "

I can't create static channels in the rest template because the names differ for every new website and there are different amounts of channels per xml-site.

So the goal would be to create a rest template which considers dynamic channel names because the standard "channel discovery" template creates the additional characters $,[,],"

Or if you have other suggestions for other approaches feel free to share.

Kind regards

prtg rest template xml