help with originating a call to an Asterisk confbridge conference

Hello Asterisk experts,

I'm trying to write an Asterisk .call file
to originate a call that should first go to an (already existent) conference

and then dial an outbound number

(so that the person that is already in the conference can follow the progress of the call)

I'm trying with some 'Local' definitions
but it's not working and I need your help.

Please bid only if you have experience with the topic.

Max 50 euros.

Thank you.