Docker newbie - on AWS, ubuntu - a question

I have spun up an EC2 with Ubuntu.
I have loaded a data file under the home directory.

I run my app within a docker container.

I need the app to import the data file, but once I run my app, I can’t find the data file.

If the data file is under a directory in the host OS, how can my app (running in the docker container) access that?

thanks for any suggestions or help.
docker newbie,