Hi,
i have a SharePoint list , and created a form using PowerApp like below

each manager is reviewing their team mate performance , they do it together and get sign from the employee (without email and access)
i have signature column where i want the employee to sign and when submit it saves it to the list , and when open the form signature has to display in the display form , and having a export button which directly download pdf copy of entire form
i have seen so many videos but not able to achieve it , any support please