SPM creating objc package header not found

I am creating simple package that contains only objective-c m and h files. The package builds fine when it;s target selected. But when I import it to ios project cannot build the package. Here is my package structure:

And here is the Package.swift

// swift-tools-version:5.3

import PackageDescription

let package = Package(
    name: "FLEX",
    products: [
        .library(
            name: "FLEX",
            targets: ["FLEX"]),
    ],
    targets: [
        .target(
            name: "FLEX",
            cSettings: [
                .headerSearchPath("Helper"),
                .headerSearchPath("ViewController")
            ]
        )
    ]
)

I think somehow headerSearchPath does not work for umbrella header?

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