There is hope. Many people in similar situations, with nothing but locally available feeds, successfully raise rabbits, as apparently the breeder you purchased your stock from is doing. Please forgive us from temperate climates who have our own list of 'known' good foods, and assume that is standard for the rest of the world. There is a fabulous free resource, called Feedipedia. Once you find someone who can help you identify the plants available to you, you can use the search box on Feedipedia to see if that is a food source. They include many tropical feeds. Each page has three tabs near the top, the first is a general description of the plant, the second tab tells about how the plant has been researched and used by species, so scroll down past all the ruminants (cows, goats, sheep), the pigs and poultry to get down to 'Rabbits'. There, you will find any research that has been done specifically for rabbits, and any guidelines developed from that work, such as 'Can be fed up to 40% of the diet' or 'Suitable for maintenance of adult stock but not for growth.' The last tab will have all the actual feed values of that plant, protein, carbs, fats, minerals.
https://www.feedipedia.org/
If you can grow sweet potatoes, the leaves are excellent fodder. I am growing some now just for that purpose. According to Feedipedia, fresh sweet potato leaves are actually 16% crude protein,
Sweet potato (Ipomoea batatas) forage | Feedipedia Mulberry leaves grow quickly, and are also very nutritious.
White mulberry (Morus alba) | Feedipedia I don't know enough about what plants you have available to you to be of further assistance, but you can spend a little time typing in the search box for foods that you have access to, to see what you can find that will work.
Perhaps someone locally can help identify the plants you have around you, or there may be an online reference for your area about local plants that will help you start to identify what is around you. It is a process, learn one plant at a time, when you find a good one, add it to your feed list. There are so many toxic plants, here as well as there, that it is best to stick to known safe plants, and then add new greens when you are confident they are safe. We once had a black cherry tree fall in our pasture. The animals adored the wilted leaves and ate them greedily, but shortly thereafter they began staggering and foaming at the mouth. Cyanide poisoning from the wilted leaves. It can happen quickly, depending on the type of poison. My neighbor was 'helping' me feed the goats, and fed them all his laurel trimmings when he pruned his shrubbery. Laurel is poisonous, and again, soon we had lethargic and staggering animals. With poisoning, bloating is often not the first symptom, although it may occur further down the process, depending on the type of poison. Some poisons are very fast acting, others attack internal organs and take their time. Any remedy is dependent on the type of poison, so if you find something is poisonous in your area that the bunnies might have gotten into, it might be worth researching any possible treatment, just to be prepared.
It is wonderful that you have found rabbits adapted to your area, and appreciate your efforts to do the best you can for them with the resources available to you. I hope with the help of Feedipedia, and perhaps conversations (online, via phone, or in person) with the original breeder, you will be able to find suitable local resources for your rabbits. I wish you all the best.
