How to create a function for Phone Dialing [for Python Django]?

I am an Python Django newbie , trying to find an function to add to my website im working on. What Im trying to do is simple operation - when you click a "Call us" button in my website, to open the Phone Dial with the specific number inputed in the phone dial input line not call immeadiately, just automatically prewrited the set phone number, as shown in the picture

I searched alot in google,git,youtube, but I couldn't find what exacly I am looking for.

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