It doesn’t look (in the clip posted above) that the Braille is on the buttons themselves, but rather a label applied by the character, e.g. https://duckduckgo.com/?q=braille+label+maker&ia=images&iax=...

You can buy Dymo labellers that output braille.

https://shop.rnib.org.uk/braille-and-labelling/labelling/bra...