The range of characters, particularly the + and / as the only punctiation, mean that this is base64 encoded. So the first step is to decode it from Base64. You can then view it as Hexadecimal which is generally much more useful for extracting data items from raw binary data records.
I don't see anywhere that Electrum document the format of a transaction file. You may have to work that out by looking for specific transaction data or for item values that you know are commonly found in bitcoin transactions as transmitted over the network.
The general format for a transaction as transmitted on the network are documented
Field Description Size Version no currently 1 4 bytes Flag If present, always 0001, and indicates the presence of witness data optional 2 byte array In-counter positive integer VI = VarInt 1 - 9 bytes list of inputs the first input of the first transaction is also called "coinbase" (its content was ignored in earlier versions) -many inputs Out-counter positive integer VI = VarInt 1 - 9 bytes list of outputs the outputs of the first transaction spend the mined bitcoins for the block -many outputs Witnesses A list of witnesses, 1 for each input, omitted if flag above is missing variable, see Segregated_Witness lock_time if non-zero and sequence numbers are < 0xFFFFFFFF: block height or timestamp when transaction is final 4 bytes
and so on.
The network order is mostly big endian so a Version no with value 1 might show in hexadecimal as 01000000
There are a handful of different transaction output types. So you might have to test for several types to get the full details.
There's no guarantee that Electrum stores its data in the network format though - it might be completely different.
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