Hi,

The bellow is an example of view for adding custom fields into a kanban view. Please give more details about what you want to do.

.py file :

class ResPartner(models.Model):
    _inherit = "res.partner"
    
    your_field = fields.Char('Your Field')

xml file: 

<record id="your_id" model="ir.ui.view">
    <field name="name">your.id</field>
    <field name="inherit_id" ref="base.res_partner_kanban_view"/>
    <field name="model">res.partner</field>
    <field name="priority" eval="2"/>
    <field name="arch" type="xml">
        <xpath expr="//field[@name='email']" position="after">
            <field name="your_field"/>
        </xpath>
    </field>
</record>