It seems that there is a special syntax in Electrum to send an OP_RETURN memo on the GUI when sending to many:
script(OP_RETURN 5468697320697320612074657374),0
tb1qerzrlxcfu24davlur5sqmgzzgsal6wusda40er,0.00003
The syntax seems to not documented, but it is mentioned on some unit tests.
As far as I could test, the OP_RETURN should be a HEX encoded string. Here is the resulting transaction
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