Change subelement with jq - json

Question

I have a structure that looks like so
[
[
{
"ID": "grp1-001",
},
{
"ID": "grp1-002",
},
{
"ID": "grp1-003",
},
{
"ID": "grp1-004",
},
{
"ID": "grp1-005",
},
{
"ID": "grp1-006",
}
],
[
{
"ID": "grp2-001",
},
{
"ID": "grp2-002",
},
{
"ID": "grp2-003",
},
{
"ID": "grp2-004",
},
{
"ID": "grp2-005",
},
{
"ID": "grp2-006",
}
.......
what I need to get as a result of the modification is this
[
[
["1", "grp1-001"],
["2", "grp1-002"],
["3", "grp1-003"],
["4", "grp1-004"],
["5", "grp1-005"],
["6", "grp1-006"],
],
[
["1", "grp2-001"],
["2", "grp2-002"],
["3", "grp2-003"],
["4", "grp2-004"],
["5", "grp2-005"],
["6", "grp2-006"],
],
Which means I need to keep the external structure (outside array and an internal grouping) but convert the inner dict to an array and replace the "ID" key with a value (that will come from external source like --argjson). I am not even sure how to start - any ideas/resources are highly appreciated.

Answer 1

Assuming you're just taking the objects and transforming them to pairs of the index in the array and the ID value, you could do this:
map([to_entries[] | [.key + 1, .value.ID | tostring]])
https://jqplay.org/s/RBac7SPfdG
Using to_entries/0 on an array gives you an array of key/value (index/value) pairs. You could then shift the indices by 1 and convert to strings.