Thanks. yes, the input source selector at the panel appears on the above iso and works well. the basic test on ibus looks good to me.
$ rpm -q ibus gnome-shell ibus-1.5.22-4.fc32.x86_64 gnome-shell-3.36.0-3.fc32.x86_64
Assigning one typeface to multiple aliases is basically wrong. particularly sans-serif and serif is different one. apparently Waree font looks like sans-serif. we should have different one for serif.