Ommiting quotes around scenario string variables in a Freemarker email template

Hi, I have a scheduled project scenario that sends an email on some condition. The scenario contains a step that sets scenario variables based on values in a dataset. Here's that step:

import dataiku
import dataiku.scenario

# Read the dataset
df = dataiku.Dataset("node-disk-usage").get_dataframe()

use_percentage_threshold = df["use_percentage_threshold"].max()  # All the thresholds are the same; we could have used min() and it would have made no difference
# Check if any row in column "over_threshold" is True
disk_usage_is_over_threshold = df["over_threshold"].any()

print(f"Disk usage is over the threshold: {disk_usage_is_over_threshold}")

# Set the flag to be used in the scenario
scenario = dataiku.scenario.Scenario()
scenario.set_scenario_variables(
    use_percentage_threshold=use_percentage_threshold,
    disk_usage_is_over_threshold=str(disk_usage_is_over_threshold).lower(),  # "true" or "false"
    first_mount_path=df["mount_path"][0],
    first_mount_path_usage=df["use_percentage"][0],
    second_mount_path=df["mount_path"][1],
    second_mount_path_usage=df["use_percentage"][1]
)

The values in the mount_path column are strings.

As part of the scenario's mail report, I have this Freemarker template snippet:

    <table border="1">
        <tr>
            <th>Mount path</th>
            <th>Use percentage</th>
        </tr>
        <tr>
            <td>${first_mount_path}</td>
            <td>${first_mount_path_usage}%</td>
        </tr>
        <tr>
            <td>${second_mount_path}</td>
            <td>${second_mount_path_usage}%</td>
        </tr>
    </table>

The issue is that the first_mount_path and second_mount_path values are rendered in sent emails with their surrounding Python quotes. Here's an example:

Mount path	Use percentage
"/"	        50.00%
"/data"	        50.00%

How to remove the rendered quotes in the Mount path table column?

Operating system used: Amazon Linux 2