nested ssh gateways/proxyjumps

So, having to go through some hoops to get rdp working via a set of hosts. Eg, I want to use the socks proxy on jump3.external (see below) to connect to say 10.34.2.10.

The ssh config that would work is:

Host jump1.local
Hostname 192.168.10.142
User user1

Host jump2.external
Hostname 10.45.11.5
User user2
ProxyJump jump1.local

Host jump3.external
Hostname 10.34.2.55
User user2
DynamicForward 60003
ProxyJump jump2.external

On the windows version of RDM this could be done I thought, but having issues doing this with the Mac version. Running 2021.1.3.0.

Any help would be appreciated.