How can i just INSERT multiple values in Firebase without OVERWRITING

i usually save multiple values in Firebase like this

but like second picture, when i save other values in same directory, then OVERWRITE (saving values and deleting previous ones) becuz it is action of “SET”

So i wonder can i just “INSERT” multiple values?

i can use REALTIME SAVE block in each value but it is not efficient when i deal with multiple values.

i think i just use ‘realtime db - save’


Maybe make the Firebase DB a list and use listInsertblock ?

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i like make a cloud list but at this time i need form as Object. thanks

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i asked becuz i insert new values to previous db but becuz of overwriting old values are gone.

Here is a thread and a link to my project that includes a function to update individual properties anywhere within a JSON hierarchy without destroying other entries.