Absolutely. The “Whitelisted app” that allows you to package your forum for both the play store and the iOS app store (whilst taking advantage of the One Signal notification service) is very good and open source but maintenance of it and the process of deployment is very involved so be prepared to have a decent budget.
My fork of the One Signal plugin (meant to be used in concert with the above) provides for more frequent chat notifications. You are of course welcome to use it but I do not provide support for free:
(NB the changes have not been PR’ed as most will not want every chat message to be sent as a notification and it doesn’t implement safeguards to manage One Signal rate limits. However this was not a concern to my client at the time. It could be further developed to make the algorithm smarter)