Next I ran this set of commands
mkdir -p ~/Projects/build/indi-libcamera
cd ~/Projects/build/indi-libcamera
cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug ~/Projects/indi-3rdparty/indi-libcamera
make -j4
sudo make install
Then I started Kstats, opened Ekos, Selected Camera to be Raspberry Pi - Libcamera, started Ekos, and set AWB Blue and Red to 1 from zero and voila, it works!