Bluetooth absolute volume control

Hello,

I wanted to know if there is a way to control absolute volume for connected Bluetooth devices, specifically for speakers.

I have a few different Bluetooth speakers at home and some will automically adjust the media volume on my iPhone when I adjust the volume on the speaker, and with other speakers, there are two independent volume controls and they are not in ‘sync’.

I’ve checked online and I can’t find anything help for iPhone but there a tons of articles about android devices.

Does anyone know if there is a way to turn absolute volume control on or off for iPhone?