So close! I'm able to use syntax highlighting AND grab the content with js (which then adds to a textarea), but the Flask for loop is only noticed on the first iteration. I can't grab the subsequent values. I need to find a way to dynamically find IDs.

app/forms.py

@@ -1,8 +1,10 @@
 from flask_wtf import FlaskForm
-from wtforms import StringField, PasswordField, BooleanField, SubmitField
-from wtforms.validators import DataRequired
+from wtforms.fields import SubmitField
+from flask_codemirror.fields import CodeMirrorField
 
+class TemplateForm(FlaskForm):
+    template_code = CodeMirrorField(
+            language='htmlembedded',
+            config={'lineNumbers': 'true'})
+    submit = SubmitField('Submit')
 
-class RequestForm(FlaskForm):
-    apikey = StringField("Academy API Key", validators=[DataRequired()])
-    submit = SubmitField("Submit")