backup DNS provider with single ISP

Hi
have single connection to ISP. primary DNS provider Adguard with additional Cloudflare. trying to achieve setup where router can detect and switch between dns provider.
does the following help switch from adguard to cloudflare if adguard is not available? thanks!

/ip/dns> pr
servers: 94.140.14.49,1.1.1.2
dynamic-servers:
use-doh-server: https://d.adguard-dns.com/dns-query/

/ip/dns> static/pr
Columns: NAME, TYPE, ADDRESS, TTL

NAME TYPE ADDRESS TTL

0 d.adguard-dns.com A 94.140.14.49 1d
1 d.adguard-dns.com A 94.140.14.59 1d
2 security.cloudflare-dns.com A 1.1.1.2 1d
3 security.cloudflare-dns.com A 1.0.0.2 1d

/ip/route
Flags: D - DYNAMIC; I - INACTIVE, A - ACTIVE; c - CONNECT, s - STATIC, v - VPN
Columns: DST-ADDRESS, GATEWAY, DISTANCE

DST-ADDRESS GATEWAY DISTANCE

DAv 0.0.0.0/0 pppoe-unifi 1
0 Is 1.1.1.2/32 pppoe-unifi 1
DAc 10.147.18.0/24 zerotier1 0
1 Is 94.140.14.49/32 pppoe-unifi 1
DAc 100.69.63.254/32 pppoe-unifi 0
DAc 192.168.0.0/24 LAN 0