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Adding quotes will output the variables as strings:

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anti_aliasing_sample_count (type string): "9"
camera_f_stop (type string): "5.6"
camera_focus_distance (type string): "5.0"
camera_fov (type string): "25.0"

For info, the syntax of the Clarisse metadata attribute is based on the Clarisse parser (used for Clarisse project files, CID files, etc.).
The Clarisse attribute is parsed and passed to OpenEXR API to create the EXR metadata. We don't control the syntax of the metadata in the EXR file.

Okay I've got it working for Nuke, was simpler than I thought, just added what you had to the rest of the values

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# Get attribute values
aa = get_double("project://scene/path_tracer.anti_aliasing_sample_count");
cam_fov = get_double("project://scene/camera.field_of_view");
cam_f_stop = get_double("project://scene/camera.f_stop");
cam_focus_dist = get_double("project://scene/camera.focus_distance");

# Can't retrieve the Camera module needed to compute the global matrix.
# But it's possible to get the Kinematics attributes: translate, rotate, etc.

# Build the metadata string with the values
# NOTE: the eval usage is a temporary workaround to allow escaping characters.
md = "anti_aliasing_sample_count " + eval("\"") + to_string(aa) + eval("\"");
md += eval("\n");
md += "camera_fov " + eval("\"") + to_string(cam_fov) + eval("\"");
md += eval("\n");
md += "camera_f_stop " + eval("\"") + to_string(cam_f_stop) + eval("\"");
md += eval("\n");
md += "camera_focus_distance " + eval("\"") + to_string(cam_focus_dist) + eval("\"");
md += eval("\n");
md += "custom_string " + eval("\"") + "hello world" + eval("\"");

# return the string
md


This now reads correctly in Nuke! Thanks again for your help, we will expand on this and share back our findings!

You're welcome!