How to amplify Rx power is sensitivity in dbm? Is there software method or will I have to use hardware wi-fi lna amplifiers?
Example: https://www.aliexpress.us/item/3256804598363058.html
by amplifying the Tx power of the sender ?
There is already maximum value configured.
then it's where you should put the amp 
I have 2 antennas with MIMO 2.4/5 Ghz
Should I have two amps for two antennas?
Im sorry my info device:
The Xiaomi MiWiFi Mini is a 802.11ac+bgn wireless router based on the MediaTek MT7620A SoC. It has three Ethernet ports and two radios (one SoC-based 2.4 GHz 802.11bgn and one PCI-based MT7612EN 2.4/5GHz 802.11abgnac, wired on 5GHz only, both 2×2 MiMo).
I have to assume you are trying PtP wi-fi outdoors.
Put a Yagi antenna on both the transmitter and receiver. Put a laser on each around dusk and point them at each other to align them so they are not sending power into the sky.
I'm sorry, but everything is easier here from house to garage, there is AP in house, client in garage. Routers themselves are at windows so that signal passes better, and external antenna did not have to be connected.
You don't have any kind of wireing between the two locations ?
Electrical, old phone line ?
No, only concrete walls. It's good idea with amplifiers, I have two LNA, but they are with additional power supply input, I think it's not worth connecting it otherwise chipset will burn out. Adapters from SMA to IPEX will be needed.
It, really, is not.
That amplifier is designed for PtP wireless.
Without the correct antenna you are likely to burn up the amp in it.
And it is, possibly, illegal.
Let's say you get one amp working great, no problems, signal is -2dBm at the garage.
How is anything in the garage going to reply wtih ACK packets?
If it is home to garage just put a flat antenna on the AP, point it towards the garage and call it a day.
It will improve reception from both garage and home.
Will it be any good if I make LNA only to receive 2.4/5 GHz antenna? Burnout chipset 100% with Rx LNA?
That link is tri-band, so it is fine but I'm not suggesting any brand. Just so you had a visual.
I have two answers:
If you meant rx on the client, no.
If you meant burn out tx amp/AP possibly.
It looks like it comes with an omnidirectional antenna so you would would be blasting 2.4 all over the place. Waste of energy, possibly piss off neighbors.
Oh thx.
yes, from client's side, I know that you cannot amplify tx to lna output, not input, reverse resistance to chipset will occur.
Use a CPE. It's a pre-engineered system of PA/LNA, directional antenna, and weatherproof case. And they are not expensive. I like the Ubiqiuti Nanostation AC loco for where you need a bit more range direct to a client than a desktop router can do. (Do not load version 23 on Ubiquiti ath79, there is a bug. Use version 22.)
Most CPEs are 5 Ghz only, and 2.4 should be avoided anyway. If you have a 2.4 only client in the garage, also add a desktop dual band router in the garage as a repeater.
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