Load the Javascript when main Dashboard loads just after Signin

Hi all,

Is it possible to do so i mean i want to load my javascript at the time when Crm just loads( after signin). My requirement is I want project templates to be created automatically once Crm load. Everytime when i move my solution into new instance i have to create these records manually in new instance so i just want that it should be created automatically when i deploy my solution in new instance. so i can write the web api for this, but i want that this web api will run automatically everytime when i just sign in or when the main Dashboard loads.

We all know  to set the script on Form Load but I want to load it just after sign in the D365 instance?

How can i do this? If it works then i will apply the checks so that record will be created only once.

Thanks for your Help!