Hi unaseerb,
Strictly speaking, the Owner field is of type "Owner", and each entity can only have one field of type "Owner", which means that it is impossible to create a second field of type "Owner".

The Owner type is characterized by the fact that it can be a two-entity lookup field, both User entity and Team entity. In your scenario, we only need it as a user.

So, we can create two more lookup fields of User entity for Lead entity.
Go to Settings > Customizations > Customize the System, expand Entities > Lead > Fields, new.


Select Data Type as Lookup, Target Record Type as User.

Then add these fields to the Lead form.
