Dynamically construct embedded data field name with loop and merge index

Is it possible to access an embedded data field in Javascript when dynamically constructing its field name?

For example, let's say the field I want is `result.elements.0.embeddedData.V1`, but I only know the last character should be `1` at runtime (the number is drawn from a loop & merge index).

I want to do something like:

var n = "${lm://CurrentLoopNumber}"; // ex. n = 1
var ed = eval("${e://Field/result.elements.0.embeddedData.V"+n.toString()+"}");

But this doesn't work, `ed` just comes up `null`.
(Sanity check: `console.log("${e://Field/result.elements.0.embeddedData.V1}");` does produce the value I'm expecting.)

I imagine this is because of the order of operations somehow (either that or `eval()` can't execute `$` syntax?) It seems like by the time my string concatenation occurs, there isn't a good way to access the embedded data with the concatenated name.

Any ideas?

Note: I found this answer which sets embedded data fields with the target index as a second L/M field.

E.g.

LM Field 1 = 2
LM Field 2 = ${e://Field/myfield_2}

That's close to what I want, but because my starting index is variable and is set by a query string, I need to do something more like

with start_ix = 1:
LM Field 1 = $e{e://Field/start_ix + 1}
LM Field 2 = $e{e://Field/myfield + $e{e://Field/start_ix + 1}}

But that doesn't work - nor do I expect it to, as I don't think embedded data "math" supports string concatenation in the same way the `+` operator can concat strings in Javascript.