`if` with shell function satisfying interface

Is there the possibility to make dot files optional via user input?
If I'm right currently there is no option to ask for user input in the `if` flag right? If yes please let me know how to do it! :)
Would be cool if one could put a function for the `if` flag, e.g.

```
-link:
~/.something:
path: configs/somewhere
if: 'checkUserInput() {
# get user input
# if input yes return true
# else false
}'
```