Assuming this is the same device:
https://wiki.archlinux.org/index.php/Lenovo_IdeaPad_7_14are05
then the touchpad should work without any additional effort. Therefore, are you sure it is enabled, (e.g. using the keyboard shortcut) and is working generally? Is it shown in the desktop environment’s input settings?
Also,
This is quite an old subversion (current is 5.10.13) - have you also tried updating and rebooting?