Providing services for creating downloadable computer programs, web-accessible computer programs, downloadable software, and web-accessible software using machine learning models, such as pre-trained large language models, pre-trained machine learning-based transformers, generative pre-trained transformers, any pre-trained neural network and the like, for natural language processing, generation, understanding, and analysis using connected customer-sources of data (e.g., knowledge bases) to take action(s) and provide one or more responses in response to exposure to stimulus data