Can't dynamic capture model variables when using nm-vars plugin

[kylebaron]

I think you can capture them, but not dynamically.

For example

library(mrgsolve)
#> 
#> Attaching package: 'mrgsolve'
#> The following object is masked from 'package:stats':
#> 
#>     filter
code <- '
$PLUGIN nm-vars
$CMT @number 2

$MAIN 
F1 = 1.23;

'
mod <- mcode("foo", code, capture = "F1")
#>  - item `F1` does not exist in model `foo`
#> Error: all requested `capture` variables must exist in the model

^{Created on 2022-05-19 by the reprex package (v2.0.1)}