Relax computed importstr ?

Do you think it will be possible to use `importstr` with variable?

e.g:

``` yaml
{
files: [
{
file: filepath,
content: importstr filepath
} for filepath in ['a.txt', 'b.txt', 'c.txt']
],
}
```

``` yaml
some_function(file):: (
local content = importstr file;
#process the content
)
```