How to Lock Ring Tone & SMS / Message Notification Levels

Is there any way ion Android or iodéOS to lock your ring tone volume(s) and the notification volume for SMS and Messages - without resorting to third party apps? Seems like a pretty basic core function that seems to not be present in even stock Android, but is there a setting somewhere I am missing?

Having to add extra apps (like “Volume Lock” or “Persist” in this instance), for every little basic function you’d expect to be present, has to be detrimental to processor capacity and potentially privacy?

Am I missing something?
:thinking:

I’m just giving this a little bump - as I am still very keen to hear if there is any way to do this. And if not what is considered the best way to do so with a third party app?

I am constantly turning the volume for notifications and ringing down to zero (muted) inadvertently, when I am holding/carrying the phone; and MISSING important calls or SMS txts…