Ask questions about how to page the web implemented by flask

@app.route('/main', methods=['GET'])
def test():
    test_list = []
    test_items = db.session.query(table_class_name).filter(table_class_name.column == 150 ).limit(9).all()
    for item in test_items:
       test_dict = {}
       test_dict['name1'] = test_items.name
       test_dict['id'] = test_items.id
       test_list.append(test_dict)
   dump_data = json.dumps(test_list)
    return render_template('test.html', dump_data=dump_data)


@app.route('/pagination', methods=['GET'])
def test_paging():
    limit_num =  request.args.get('num')
    test_list = []
   test_items = db.session.query(table_class_name).filter(table_class_name.column == 150 ).limit(9).all() # You have to put a limit range on this part!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    for item in test_items:
       test_dict = {}
       test_dict['name1'] = test_items.name
       test_dict['id'] = test_items.id
       test_list.append(test_dict)
   dump_data = json.dumps(test_list)
    return dump_data

First of all, please consider that the above functions are examples and read the questions
Currently, the final feature you're trying to create is a page on the web implemented by flask, where some information is listed sequentially, and its initial number of data is 9.
In order to see additional data, I want to make the data visible by 5 when the read more button is pressed
For the above code, when you press read more on the page '/main', the limit section is applied at the place '/pagination' so that you can get 5 more after 9 pieces of data on the web.
So in the HTML document, I wrote it in the form of handing over the value to Ajax in '/pagination' How can I fill out the additional data so that every time I press read more, I get more than 5 pieces of data?
First of all, when I press read more, num is given 5 to pass the number 5 in the form of json When you receive the number 5 from '/paginatnion' and click limit 11-15 for the first time, data is added to 5 that was first passed, and the 5 is added to 10 againI was going to make a crab I don't know how to add the number 5 every time I press read more and how to use the limit function grammar in the part using sqlalchemy I would appreciate it if you could also tell me how to use sqlalchemy limit
Regarding the question, even if I google it, I don't know the access itself, so I can't get the necessary information.