Getting a trend value for a subset of the calculation for a chart

DAX DAX Calculations
1

I have a linear regression trend line. Pop it on the chart and it works great. However if I want a card for a subset of that trend it behaves differently as that subset will produce different values. (Its the context of the number of months - this shapes the trend)

I think I need to create the trend and predicted sales as per my chart but then sum a subset .

In Dax Studio I got as far as the code below. If I could get the total value of Banana from __DSCCore this would give me the answer.

Hope that makes sense. Any suggestuions gratefully received.
E

DEFINE

VAR __YearOffset = TREATAS({-1, 0, BLANK()}, ‘dim Year’[Year offset])

VAR __DS0Core =
SUMMARIZECOLUMNS(
‘dim Fiscal Year’[FiscalYearPeriod],
‘dim Fiscal Year’[Fiscal Month offset],
__YearOffset,
“Banana”, IF ( MAX(‘dim Year’[Month offset]) >-1 ,‘MM’[Trend Regression] ,0),
“Trend Sales”, ‘MMs’[Trend Sales],
“Trend Regression”, ‘MM’[Trend Regression]//,
)

EVALUATE __DS0Core
ORDER BY
      'dim Fiscal Year'[Fiscal Month offset], 
      'dim Fiscal Year'[FiscalYearPeriod]
2

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3

@EnterpriseDNA
Still stuck on this and its not getting any clearer
E