C# Declare variable in lambda expression

I want to do a simple lambda expression like this:

IList<MyEntity1> list = GetSomeList();

MyEntity1 result = list.SingleOrDefault<MyEntityList>(
    e => GetMyEntity2(e) != null && GetMyEntity2(e).Id != null && GetMyEntity2(e).Id > 0
);

That works perfectly, but getting MyEntity2 from MyEntity1 is not so simple so I would like to declare a variable into the lambda expression to save MyEntity2 and use it, instead of calling again and again to GetMyEntity2 method. Is that possible?

Note: The code is just an example that reflects my real case.

Thanks!