Yes, there are tools you can use to help automate the conversion of your text file and images into an epub format. Here are a few options you can consider:

1. Calibre: Calibre is a free and open-source software that can help you manage your e-book library and convert between different e-book formats. It supports many input formats including text files and images, and it can automatically generate an e-book table of contents.

2. Sigil: Sigil is a free and open-source software that can be used to edit and create e-books in the epub format. It includes a WYSIWYG editor that can help you format your e-book with ease.

3. Amazon Kindle Direct Publishing (KDP): Amazon's KDP allows you to upload your e-book in several different formats including text files, Word documents, and HTML files. KDP will automatically format your e-book for Kindle devices, and you can preview the result before publishing.

With these tools, you can easily convert your text file and images into a well-formatted epub file.
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