After JUNOS installation on QEMU, now the next step is to integrate JUNOS with GNS3. This is only possible by adding cloud in the GNS; add the TAP1 interface in cloud and connect that interface with cisco router.
See the depicted images:-
Image 1:- Configure cloud interface with TAP1 interface
Image 2:- Select the TAP1 interface
Image 3:- Connect TAP1 interface of cloud with Cisco GNS3 router.