Hi,

You can create a custom module to achieve this.
What you need to do is inherit the crm.lead model and in its create function, update the code to add the details to the channel that you want.
Please refer the below code below to get an idea:

_inhert = 'crm.lead'

@api.model

def create(self, vals):

​ res = super().create(vals)

​ message = (" name %s ') % res.name

​ required_channel = self.env['mail.channel'].search([], limit=1)

​ required_channel.message_post(

​ ​ body=message,

​ ​message_type='comment',

​ ​subtype_xmlid='mail.mt_comment',)

​ return res

Hope it helps