Make sure you have the official kali for termux installed from: https://www.kali.org/docs/nethunter/nethunter-rootless/.
apt install -y git proot-distro
git clone https://github.com/DefkieHaust/Bind-Termux-Kali-with-Proot-distro.git && cd Bind-Termux-Kali-with-Proot-distro
./bind-kali.sh
You can bind or unbind kali by running bind-kali.sh