Passing Arguments to ModelView edit template in flask-admin

I am trying to learn more about Flask by building a CMS. I am using flask-admin to add the posts, images etc.

I have managed to override textarea with ckeditor. But I want to pass the paths of the images in the static folder to ckeditor image plugin.

I can't figure out how to pass parameters to my edit.html template.

Here's the code:

class TestAdmin(ModelView):
    form_overrides = dict(text=forms.CustomTextAreaField)
    create_template = 'edit.html'
    edit_template = 'edit.html'

From the documentation of flask-admin I have found that _template_args can used to pass parameters to the template. But I can't figure out how.

What is the exact way to do that?