How to retrieve a parameter value based on a result set from stored procedure in SSRS 2014?

Hello Experts,

I would like to know how do I select a parameter based on the result set from a stored procedure.

My code looks something like this:

CREATE PROCEDURE usp_UserInformation (@ReportRunDate DATE = NULL)
AS
WITH CTE AS (
SELECT -- some fields
FROM Table1 INNER JOIN Table2 ON Table1.ID = Table2.ID
WHERE RegisteredDate = DATEADD(MONTH, DATEDIFF(MONTH, -1, @ReportRunDate) - 2, -1)
--I'll output the result set after applying all the logic like

SELECT User_ID, UserName, DOJ
FROM CTE

Now, when the user selects the date on the report, I created another parameter and trying to retrieve records from the "Available Values" using 'Get values from a query'. I would like to show the list of UserIDs from the above query result set and allow the user SELECT based on that.

Here are the screenshots for what I am doing if that helps:

PS: I am not allowed to write in-line SQL and only SPs are allowed. I don't want to create two SPs for the same report.

Known is a DROP, Unknown is an OCEAN.