Guys, an interesting question - is there any way to transfer data, from JSON for example, to a smart contract directly (maybe using JS)?

you can load up the .json in your javascript environment and parse it as you wish, then you send it through functions to the contract.
I do similar things with migrations, those are .csv files parsed and cleaned by another script, an hardhat script does the checks & migration fully auto

Could you share any example? I will be very grateful

thank you

from there you can handle your json and your actions as you want

And one more question quickly - in idea I can parse values in a specific argument of a function? Figuratively, the function takes a string and a unit, and I take two values from JSON and throw one value into the string slot and the other into the unit slot. Is it possible to do this?

yup

Merci