%include and jinja2 not recognised when inside [[graph]] section

[MetRonnie]

E.g.

%include foo.cylc
[scheduling]
    [[graph]]
%include foo.cylc

Also:

[scheduling]
    [[graph]]
{% for date in DATES %}

Although jinja2 is recognised inside a graph setting inside the graph section, i.e.

[scheduling]
    [[graph]]
        R1 = """
            {{ foo }}
        """

(Note jinja2 is not highlighted by GitHub theme anyway)