I found solution which is working:-

first of all it was my mistake that I created `~/.Xcompose` instead of `~/.XCompose`
Install uim (Universal Input Method)
Add `export GTK_IM_MODULE="uim"` to `~/.profile`
Restart the gnome-session


Now custom compose key sequence defined in `~/.XCompose` is working fine.

Note that `export GTK_IM_MODULE="xim"` is not working.

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