Merge of data containers

If i want to merge a unknown number of data containers into one json
array ?

Like this:
-----

"a"
   data => parsejson('{ "ifname": "lo"}');
"b"
   data => parsejson('{ "ifname": "enp1"}');                  

"ifs"
   slist => { "a", "b"};

"a_b"
   data => mapdata( "json", '$(this.v)' , "ifs");
----

The last maplist doesn't work while:
----
"a_b"
   data => mapdata( "json", '{ "stats": $(this.v) }' , "ifs");
---

works.

This has to do with differences in the 'ip link' tool between the one
in debian9 and debian10/debian11 (in that case i can use the json
directly from 'ip --json link show').

So how to load data from multiple datacontainers into a json array in
a data container ?

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