Hi,

1. Create a XML file (client_action_views.xml)

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <!--    Action to show the Dashboard-->
    <record id="advanced_dashboard_action" model="ir.actions.client">
        <field name="name">Advanced Dashboard</field>
<field name="tag">advanced_dashboard</field>
    </record>
    <!--    Menu Item to show the dashboard menu in the module-->
    <menuitem name="Dashboards" id="advanced_dashboard_menu"
sequence="1" action="advanced_dashboard_action"/>

</odoo>

2. Create a JS file(client_action.js)

/** @odoo-module */
import { registry} from '@web/core/registry';
import { useService } from "@web/core/utils/hooks";
const { Component, mount} = owl
export class AdvancedDashboard extends Component {
setup(){
    this.action = useService("action");
    this.rpc = this.env.services.rpc
}
loadData(){
    let self = this;
      rpc.query({
        model: 'partner.dashboard',
        method: 'get_values',
        args:[]
        }).then(function(data){
            console.log(data, 'dataaaa')
            self.AdvancedDashboard.data = data;
    });
}
}
AdvancedDashboard.template = "client_action.advanced_dashboard"
registry.category("actions").add("advanced_dashboard", AdvancedDashboard)

3. Create a Python file (partner_dashboard.py)


from odoo import api, fields, models
class EmployeeDashboard(models.Model):
_name = 'partner.dashboard'
_description = 'Partner Dashboard'
user_id = fields.Many2one('res.users', string='Users')
name = fields.Char(string='Partner Name')
@api.model
def get_values(self):
    data = self.env['partner.dashboard'].search([])
    # we can add the values to the dashboard
    return data.read()

4. create a Xml file in static/src/xml(client_action.xml)

<?xml version="1.0" encoding="UTF-8"?>
<!-- Template for the Advanced Dashboard -->
<templates id="template" xml:space="preserve">
<t t-name="client_action.advanced_dashboard">
        <div>
            <span>Test Case</span>
            <h1><center><span>Partner Details</span></center></h1>
        </div>
<!--    You can add the templates here-->
    </t>
</templates>

5. Add manifest like format
'data': [
    'views/client_action_views.xml'
],
'assets': {
    'web.assets_backend': [
        'client_action/static/src/js/client_action.js',
        'client_action/static/src/xml/client_action.xml',
    ],
},

Please refer to this blog:

Client Action in Odoo17

Hope it helps