does anyone know what is the Fee value we should put in here for TON blockchain?

(Validator income => purely all from the gas cost or no?)

120 Toncoin per day generated in addition to gas fee .Additionally, new coins are generated during validation. These also go to validators. Overall annual coin inflation is about 0.5%.

120 tonCoin is on the config setting or no?

https://docs.ton.org/participate/network-maintenance/staking-incentives#positive-incentives