I'm using Zabbix 7.0.4 and I'm using the template Proxmox VE by HTTP that has predefined item prototypes like these:

I want to create a new item prototype for Proxmox VE by HTTP that calculates the % of used memory

I plan to do the same thing for filesystems to use them in Grafana and receive alerts.
I have tried with 100*last(/Proxmox VE by HTTP/proxmox.node.memused[{#NODE.NAME}])/last(/Proxmox VE by HTTP/proxmox.node.memtotal[{#NODE.NAME}]) but I receive same error
