Hi @MD: Niamul ,
Welcome to Atlassian community.
In general the apps are installed in confluence from Market place. I did a quick search on the market place and does not look like this app is available for now. But i found how you can install it on any websites. You might want to check on the below links and try the same.
I have not tested this and never tried as well. So, you might want to test and let us know if it worked. Happy installing :)
Have a good day.!
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