Hello,
I do not understand this amalgamation Sweden / Australia, let either a Swedish user of Rog Phone 5 answer (specifying the operator because on the 4 the services can be different) or ASUS which must be able to answer this question.
For the eSim card, a No is not a good answer, no Asus Rog 5 does not have the eSim electronic circuit, but there are 2 possibilities to make a non-eSim device eSim compatible.
One is specific to the operator who deliver devices that are not materially compatible with an eSim package, these devices are blocked with the operator.
The second is easier and compatible with many recent non-eSim original smartphones, you have to order an eSim (in fact an electronic circuit which is inserted in place of the Sim1) and a software, everything is here
https://esim.me/fr/esim-pour-Asus-ROG%20Phone%205-?search=asus&description=truehttps://play.google.com/store/apps/details?id=esim.me