Missing debian runtime dependencies for a software that im trying to package

[Aryan Karamtoth <aryankmmiv@outlook.com>]

I'm packaging an Ollama app called Alpaca bearing the WNPP Bug tracking ITP ID: #1108419

The problem is that there are a lot of packages listed by the owner of this software that aren't available on debian. Most of these packages are python libraries. 

The missing packages are:

• Python Pillow
• Youtube-Transcript-API (python library)
• ODFpy (python library)
• PyICU (python library)
• Openai (python lib)
• MarkItDown (python lib)
• DuckDuckGo-search (python lib)
• LibSpelling (by GNOME)

These packages need to be mentioned in debian/control under Depends but I can't find them on debian package index. Does anyone suggest any alternatives here?

This software was made for GNOME using GTK4 + libadwaita and uses Meson for build system. There's no official documentation for building meson projects on debian so if anyone can help me with that too, it'll be very helpful.