Saving a document with large integer values

I tried as well to save it as a string but it’s still not working despite chaning mongoose schema to a string.
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EDIT: If I try to parse the string and treat it as json just like in the link you sent when adding to database, can this actually help it ?
Edit 1.5: Tried to parse and stringify but no use… Isn’t there a way to like change how json works for mongodb?

EDIT 2: I have seen something and Visual studio code gave me a “fix” to make it actually show in database the exact number for the id but that’s working only if I have like the number defined already in a variable and adding an “n” to the end meaning it “covert to bigint numeric literal” but how I can do it with a variable name?