[Python] How to pass variable to Flask HTML form

At the moment I can successfully add the record by manually typing username & passphrase on HTML form. How can I pass the passphrase (dinopsk) from dinopass1 function to the form passphrase input?

app.py:

def dinopass1():
response = requests.get("https://www.dinopass.com/password/simple")
dinopsk = response.text
#print(dinopsk)


@app.route("/add_user", methods=["GET", "POST"])
def add_user():
if request.method == "POST":
headers = {"Authorization": f"{xxxx}"}

new_user = {
"username": request.form["name"],
"passphrase": request.form["passphrase"]
}
requests.post(
"API_URL", json=new_user, headers=headers
)
return redirect(url_for("add_user("))


add.html:

<form action="{{url_for('add_user')}}" method="POST">

<div class="form-group">
<label>Name:</label>
<input type="text" class="form-control" name="name" required="1">
</div>


<div class="form-group">
<label>Passphrase:</label>
<input type="text" class="form-control" name="passphrase" required="1">
</div>


<div class="form-group">
<button class="btn btn-primary mt-4" type="submit">Add</button>
</div>
</form>

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