Web API-URL Syntax of Multi-Provider, Multi-Dataset Query

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I have 4 seperate URL query strings for Japan-only quarterly data across various datasets/providers that all work fine individually (CSV format):
OECD: EO - JPN, [ALL SERIES], QUARTERLY
https://api.db.nomics.world/v22/series/OECD/EO?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“FREQUENCY”:[“Q”],“LOCATION”:[“JPN”]}&format=csv
OECD: MEI - JPN, [ALL SERIES], QUARTERLY
https://api.db.nomics.world/v22/series/OECD/MEI?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“FREQUENCY”:[“Q”],“LOCATION”:[“JPN”]}&format=csv
IMF: IFS - JP, [ALL SERIES], QUARTERLY
https://api.db.nomics.world/v22/series/IMF/IFS?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“FREQ”:[“Q”],“REF_AREA”:[“JP”]}&format=csv
BIS Property prices: long series - Japan, QUARTERLY
https://api.db.nomics.world/v22/series/BIS/long_pp?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“FREQ”:[“Q”],“REF_AREA”:[“JP”]}&format=csv

If I wanted to combine these into 1 single query string and say dump ALL data from over common period 1970Q1-LatestQ, its not clear from the API doc/guide exactly how to combine the URL query - some elements will be common & so can avoid being duplicated. My numerous attempts have been unsuccessful so far. (I presume any combined URL could only be at a common frequency ie we couldn’t combine Quarterly & Annual data in same URL ?)
Any pointers on combination syntax would be v welcome

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Try to add to you cart several series. Then go to the cart webpage https://db.nomics.world/cart and see the csv url. Mine is for instance : https://api.db.nomics.world/v22/series?observations=1&series_ids=OECD/EO/ITA.CPIH_YTYPCT.A,IMF/WEO/ITA.PCPIPCH&format=csv .

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Thanks, cart works fine for combining a small no. of individual series (using “&series_ids”) but my efforts to combine larger GROUPS of series (too many series for Time Series Explorer) seem to fail: eg where I try to combine:

OECD:QNA Japan-Quarterly-All Series
https://api.db.nomics.world/v22/series/OECD/QNA?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“LOCATION”:[“JPN”],“FREQUENCY”:[“Q”]}
OECD:MEI Japan-Quarterly-All Series
https://api.db.nomics.world/v22/series/OECD/MEI?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“LOCATION”:[“JPN”],“FREQUENCY”:[“Q”]}
OECD:EO Japan-Quarterly-All Series
https://api.db.nomics.world/v22/series/OECD/EO?limit=1000&offset=0&q=&observations=1&align_periods=1&dimensions={“LOCATION”:[“JPN”],“FREQUENCY”:[“Q”]}

Is it possible to combine these GROUP extractions in a SINGLE string ?