How to make a custom report with a wizard in Odoo ?

custom_report.xml

<odoo>
    <record model="report.paperformat" id="paperformat_a4">
        <field name="name">paperformat.custom.report</field>
        <field name="default" eval="True"/>
        <field name="format">A4</field>
        <field name="page_width">0</field>
        <field name="page_width">0</field>
        <field name="orientation">Portrait</field>
        <field name="margin_top">30</field>
        <field name="margin_right">5</field>
        <field name="margin_bottom">10</field>
        <field name="margin_left">5</field>
        <field name="header_line" eval="False"/>
        <field name="header_spacing">20</field>
        <field name="dpi">90</field>
    </record>

    <report id="your_report_name_action"
            model="your_model_name.report.wizard"
            string="Custom Report"
            report_type="qweb-pdf"
            name="your_module_name.your_report_name_view"
            print_report_name="'%s' % (object.title)"
            paperformat="paperformat_a4"
            menu="False"/>

    <template id="your_report_name_view">
        <t t-call="web.html_container">
            <t t-call="web.external_layout">
                <div class="page">
                    <h2 class="text-center"><t t-esc="title"/></h2>
                    <t t-foreach="docs" t-as="doc">
                        <t t-esc="doc['first_variable']"/>
                    </t>
                </div>
            </t>
        </t>
    </template>

</odoo>

custom_report_wizard.py

from odoo import models, fields, api
from odoo.exceptions import ValidationError
import logging

_logger = logging.getLogger(__name__)

class ReportWizard(models.TransientModel):
    _name = 'your_model_name.report.wizard'

    title = fields.Char(required=True)

    def print_report(self):
        """Call when button 'Get Report' clicked.
        """
        
        docs = []

        docs.append({
            'first_variable': "anything that goes to the report",
        })

        data = {
            'doc_ids': self.ids,
            'doc_model': self._name,
            'title': title,
            'docs': docs,
        }

        # use `module_name.report_id` as reference.
        # `report_action()` will call `get_report_values()` and pass `data` automatically.
        return self.env.ref('your_module_name.your_report_name_action').report_action(self, data=data)


class ReportTemplate(models.AbstractModel):
    """Abstract Model for report template.
    for `_name` model, please use `report.` as prefix then add `module_name.report_name`.
    """

    _name = 'report.your_module_name.your_report_name_view'

    @api.model
    def _get_report_values(self, docids, data=None):
        return data

custom_report_wizard.xml

<odoo>
    <record model="ir.ui.view" id="custom_report_wizard">
        <field name="name">Custom Report</field>
        <field name="model">your_model_name.report.wizard</field>
        <field name="type">form</field>
        <field name="arch" type="xml">
            <form string="Custom Report">
                <group>
                    <field name="title"/>
                </group>
                <footer>
                    <button name="get_report" string="Get Report" type="object" class="oe_highlight"/>
                    <button string="Cancel" special="cancel"/>
                </footer>
            </form>
        </field>
    </record>

    <!-- active_ids will give you a list of the selected records from the tree view of your binindg model ex. sale.order -->
    <act_window id="action_custom_report_wizard"
                name="Custom Report"
                res_model="your_model_name.report.wizard"
                context="{'default_your_m2m_or_o2m_field': active_ids}"
                view_mode="form"
                binding_model="your_binding_model"
                binding_views="list"
                target="new"/>

</odoo>