You need to manually create and populate an IOptions<SampleOptions> object. You can do so via the Microsoft.Extensions.Options.Options helper class. For example:
IOptions<SampleOptions> someOptions = Options.Create<SampleOptions>(new SampleOptions());
You can simplify that a bit to:
var someOptions = Options.Create(new SampleOptions());
Obviously this isn’t very useful as is. You’ll need to actually create and populate a SampleOptions object and pass that into the Create method.