Shortcut launcher created by ShortcutManager is not visible at Bixby single/double press to open app list

Question

So I have a secondary Activity but I don't want to make it visible on home screen on app install, so it doesn't have Main action and Launcher category declared in the manifest:

<!--<intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>-->

A user can add it manually if needed:

val shortcutInfo =
    ShortcutInfo.Builder(appContext, key)
        .apply {
            setShortLabel(getString(R.string.app_name))
            setLongLabel(getString(R.string.app_name))
            setIcon(
                Icon.createWithResource(
                    appContext,
                    R.mipmap.ic_launcher
                )
            )
            setIntent(activityIntent)
        }.build()
shortcutManager.requestPinShortcut(shortcutInfo, null)

but the problem that such shortcuts are not visible for Samsung Bixby (or similar assistants on other phones) for launching as an app by pressing the Bixby button

Is there a way to launch secondary activities from Bixby without declaring those activities as main launchers in manifest?