Hi SmartHQissue,
By default, apps on your iPhone that have a watchOS app available are automatically installed and appear on the Home Screen as mentioned here: Get more apps on Apple Watch.
The best step would be to reach out to the app developer. They would be the best resource for compatibility information. If needed, this article will walk you through how to contact them: How to contact an app developer.
Contact the developer of an iOS, iPadOS, or watchOS app
1. Open the App Store on your iPhone or iPad.
2. Search for the app, then tap it. If you can't find it, tap the account button
or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app.
3. The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID.
Cheers.