That's actually certainly possible, most of it is probably water and sugar lol. Although I haven't managed to actually find the amount of caffeine online, when I get another one I'll see if that information is available in the drink.

Anecdotal [0]: The federal government has attempted in the 40s to require that Guaraná sodas had at least 0.5% of it's contents in Guaraná seeds, however even that was already too much caffeine so it didn't happen!

edit: Found a source for this, Guarana Antarticá has around 1/10 of the caffeine in Coca-Cola [1].

[0]: https://pt.m.wikipedia.org/wiki/Guaran%C3%A1_Antarctica (in portuguese, try translating with DeepL or Google Translate)

[1]: https://www.mundoboaforma.com.br/lista-de-20-alimentos-que-c... (in portuguese, try translating with DeepL or Google Translate)