Is this posible to make?

I need to set Internet gateway on client side on wlan port of the router OmniTIK U-5HnD
[admin@MikroTik] > interface print
Flags: D - dynamic, X - disabled, R - running, S - slave

NAME TYPE MTU L2MTU MAX-L2MTU

0 R ether1 ether 1500 1600
1 R ether2 ether 1500 1598 2030
2 ether3 ether 1500 1598 2030
3 ether4 ether 1500 1598 2030
4 ether5 ether 1500 1598 2030
5 R wlan1 wlan 1500 2290
6 R hotspot bridge bridge 1500 1598
[admin@MikroTik] > interface bridge port print
Flags: X - disabled, I - inactive, D - dynamic

INTERFACE BRIDGE PRIORITY PATH-COST HORIZON

0 ether2 hotspot bridge 0x80 10 none
1 wlan1 hotspot bridge 0x80 10 none
2 I ether3 hotspot bridge 0x80 10 none
[admin@MikroTik] > interface wireless registration-table print

INTERFACE RADIO-NAME MAC-ADDRESS AP SIGNAL-STRENGTH TX-RATE UPTIME

0 ;;;
wlan1 -61dBm@54Mbps 54.0... 8h13m33s
1 ;;;
wlan1 -55dBm@6Mbps 54.0... 8h13m33s
2 ;;;
wlan1 -69dBm@6Mbps 54.0... 8h13m33s
3 ;;;
wlan1 -64dBm@54Mbps 54.0... 8h13m33s
4 ;;;
wlan1 -68dBm@6Mbps 36.0... 8h13m33s
5 ;;; RB 750
wlan1 AirGrid M5 HP -86dBm@6Mbps 24.0... 8h13m28s

Behind all of this clients are APs with clients getting dhcp address from hotspot bridge
[admin@MikroTik] > ip address print

Flags: X - disabled, I - invalid, D - dynamic

ADDRESS NETWORK INTERFACE

0 ;;; added by setup
10.1.2.1/24 10.1.2.0 hotspot bridge
1 ;;; added by setup
10.1.3.1/24 10.1.3.0 ether1

[admin@MikroTik] > ip route print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit

DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 A S ;;; ADSL
0.0.0.0/0 10.1.3.3 1
1 X S ;;; test ADSL NOVI
0.0.0.0/0 10.1.3.4 1
2 X S ;;; test2 ADSL
0.0.0.0/0 10.1.2.2 1
3 ADC 10.1.2.0/24 10.1.2.1 hotspot bridge 0
4 ADC 10.1.3.0/24 10.1.3.1 ether1 0
5 A S 192.168.1.0/24 10.1.2.3 1
6 A S 192.168.99.0/24 10.1.2.3 1

One of the clients is ubiquiti grid with address 10.1.2.2 and its lan port is @ MT rb750 with address 10.1.2.3.
RB 750 has its default gateway 192.168.1.1.
Is it possible to add rb 750 gateway to first router to be default gateway