We are using MikroTik LtAP LTE6 kit in our network as LTE AP where several devices are connected via Wifi to Internet and cloud services. Also we are using wireguard VPN to connect to the system remotely and we can connect to MikroTik user interface via VPN but other devices which are connected to MikroTIK LAN port are not reachable via wireguard (VPN) - only if we are connected to MikroTik WiFi od via LAN cable. Is there some option to bridge wireguard interface and LAN interface or something like that?

Depends on the firewall rules........
How did you ensure the wireguard could reach the device and config it???

I upload my configuration in file.
I can access the mikrotik configuration and ping the mikrotik via wireguard from my phone and laptop, but I cannot access or ping other devices via wireguard that are connected by an ethernet cable (LAN) on the same switch as MIKROTIK and have IP addresses 192.168.88.xx.

(1) Not sure why you have a pool called VPN ranges?? Wireguard only gets an address in the MT installation, nothing else, there is no DHCP etc...

OKAY, please look at this and you TELL ME what is wrong....... You will want to kick yourself!!

/ip address
add address=192.168.88.1/24 comment=defconf interface=bridge network=\
192.168.88.0
add address=192.168.88.1 interface=wireguard1 network=192.168.88.0

YOU NEED to decide what is easier to change.
LAN to 192.168.89.0 ( my recommendation)
OR
Wireguard to 192.168.9.0

(2) The router is the wireguard server and thus do not need second masquerade rule.

(3) IP routes have to be fixed there is no need for you to add a wireguard IP route.
The router automatically creates one for local interfaces
( are there remote subnets requiring access or local users need to reach..........dont think so! )