Count rows in table visual with Field Parameters

Here is the query for both parameters

// DAX Query
DEFINE
	VAR __DS0Core = 
		SUMMARIZECOLUMNS(
			'ledger_fy22_qtr1'[FISCAL_YEAR],
			'ledger_fy22_qtr1'[ACCOUNTING_PERIOD],
			"SumPOSTED_TOTAL_AMT", CALCULATE(SUM('ledger_fy22_qtr1'[POSTED_TOTAL_AMT]))
		)

	VAR __DS0PrimaryWindowed = 
		TOPN(
			501,
			__DS0Core,
			'ledger_fy22_qtr1'[FISCAL_YEAR],
			1,
			'ledger_fy22_qtr1'[ACCOUNTING_PERIOD],
			1
		)

EVALUATE
	__DS0PrimaryWindowed

ORDER BY
	'ledger_fy22_qtr1'[FISCAL_YEAR], 'ledger_fy22_qtr1'[ACCOUNTING_PERIOD]

and here for only fiscal period selected

// DAX Query
DEFINE
	VAR __DS0FilterTable = 
		TREATAS({"'ledger_fy22_qtr1'[FISCAL_YEAR]"}, 'Parameter'[Parameter Fields])

	VAR __DS0Core = 
		SUMMARIZECOLUMNS(
			'ledger_fy22_qtr1'[FISCAL_YEAR],
			__DS0FilterTable,
			"SumPOSTED_TOTAL_AMT", CALCULATE(SUM('ledger_fy22_qtr1'[POSTED_TOTAL_AMT]))
		)

	VAR __DS0PrimaryWindowed = 
		TOPN(501, __DS0Core, 'ledger_fy22_qtr1'[FISCAL_YEAR], 1)

EVALUATE
	__DS0PrimaryWindowed

ORDER BY
	'ledger_fy22_qtr1'[FISCAL_YEAR]


// DAX Query
DEFINE
	VAR __DS0FilterTable = 
		TREATAS({"'ledger_fy22_qtr1'[FISCAL_YEAR]"}, 'Parameter'[Parameter Fields])

	VAR __DS0Core = 
		CALCULATETABLE(
			SUMMARIZE(
				'Parameter',
				'Parameter'[Parameter Fields],
				'Parameter'[Parameter Order],
				'Parameter'[Parameter]
			),
			KEEPFILTERS(__DS0FilterTable)
		)

	VAR __DS0BodyLimited = 
		TOPN(
			152,
			__DS0Core,
			'Parameter'[Parameter Order],
			1,
			'Parameter'[Parameter Fields],
			1,
			'Parameter'[Parameter],
			1
		)

EVALUATE
	__DS0BodyLimited

ORDER BY
	'Parameter'[Parameter Order], 'Parameter'[Parameter Fields], 'Parameter'[Parameter]

That means you can use concatenatex(parameter,[Parameter],",")  or similar to figure out which field parameters are currently selected. From there you can calculate the count of "rows" in the table visual.