The set.pmk function is used to "encrypt" data transmissions, you set the same key in the transmitter and receiver. I have not had the opportunity or need to test if it works. You can find a library for arduino esp-now on the internet. Practically the functions have the same or similar names as those in python. I think the easiest way would be to send from the transmitter all values separated by commas as text and receive them the same way. in uiflow or in python using split function which will make you a list with separated values
Lists -> make list from text with delimiter.
As a delimiter you set your separator character e.g. ","
Then you read each value with
Lists -> in list ... get # item number
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