Include template files in poetry project

I have a command line python app using poetry, that I would like to ship with a couple of jinja2 template files. As of know I have them in a template directory. How would I go about shipping those templates with the app and how do I make sure that the app knows where the templates are located?

Here's my (naive) attempt at using pkgutil to accomplish this:

directory structure:

.
├── app.py
├── LICENSE
├── poetry.lock
├── pyproject.toml
└── templates
    └── message.en_US.jinja2

app.py:

import pkgutil
from jinja2 import Environment, FileSystemLoader

data = pkgutil.get_data(__name__, "templates")

env = Environment(loader=FileSystemLoader(data))
template = env.get_template("message.en_US.jinja2")
print(template.render({"foo": 1, "bar": 2}))

pyproject.toml:

[tool.poetry]
name = "app"
version = "0.1.0"
description = "Does stuff"
authors = ["Foo Bar <foo@bar.com>"]
license = "AGPL-3.0-or-later"

[tool.poetry.dependencies]
python = "^3.8"
jinja2 = "^2.11.3"

[tool.poetry.scripts]
app = "app:main"

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

This fails because the templates folder doesn't get packaged. I also don't know if I can pass the folder to the Environment constructor like this.