A 'Speak' / 'Voice' option is missing in the message context menu. WA, Apple Messages, etc. have proper support for it.
Please note that this feature is not only useful for people with visual issues but also for people that wants to listen to a message while doing other stuff like house-cleaning.
You first need to enable it on iOS Settings > Accessibility > Spoken Content > Speak Selection. On WA it's available by holding on a message > Voice.
Currently the context menu has too many items and it would be better to wait to see a 'More items' option first.