Angular How to make [formControl] an optional field

In Angular you can add attributes to inputs and make them optional using attr:

<input [type]="text" [attr.id]="id">


But how do you make a form control optional? I want something like this:

<input [type]="text" [attr.formControl]="someControl">


Where the formControl will not be set if someControl is undefined or null?

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