SQL - Unpivot unknown number of columns to rows

Dear Experts,

Could you please have a look on the below short example (it can be reproduced by creating the below temp table and inserting those values),

CREATE TABLE
   #TempTable (
      CountryCode nvarchar(2),
      CountryName nvarchar(20),
      SearchTerm int,
      TaxNumber int,
      VAT int
      );

INSERT INTO
   #TempTable (CountryCode, CountryName, SearchTerm, TaxNumber, VAT)
VALUES
   ('AD', 'Andorra', 2, 3, 6),
   ('AL', 'Albania', 22, 32, 6),
   ('AM', 'Armenia', 24, 3, 66),
   ('AO', 'Angola', 11, 5, 9)

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which per its logic being as a summary by countries, counting SAP fields filled for them:


Could you please advise which SQL code (Microsoft SQL Server) would be able to unpivot that table in the following format?


Briefly the target would be that the columns (SearchTerm, TaxNumber, VAT) with numbers should become rows, also would like to mention that searching for a dynamic solution as there are more than 150 columns are in the live environment

Thanks in advance,