Why do you post a question as a feature request?
To answer your question: you don’t have to “import” anything - just copy them into your vault. Your obsidian notes actually are text files (ending with .md, which stands for “markdown”). If by text files you mean files with the filenam extension .txt, just rename them to .md to make them editable within obsidian. Thus, if you have a file called “example.txt”, rename it to “example.md”, copy it into your vault and that’s it.