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Then have a property, most probably of type `RegularFileProperty` that you annotate with `@InputFile`

Will it work also if the file does not exists?

But actually iirc if you configure something, it must exist. You can add `@Optional` but that means it does not have to be configured. If it is configured, it must still exist.
If you want to support configuring a path but not requiring it to exist you have to do it differently, like having it `@Internal` and then having a derived one that is `@InputFile` and `@Optional` where the provider is empty if the file does not exist.

Something like (untested)
```abstract class MyTask : DefaultTask() {
    @get:Internal
    abstract val inputFile: RegularFileProperty

    @get:Optional
    @get:InputFile
    val optionalInputFile = inputFile.map {
        if (it.asFile.isFile) it else null 
    }
}```