Import-Module Microsoft.Graph.Beta.Sites
Get-MgBetaSiteListItem -SiteId $siteId -ListId $listId -ExpandProperty "fields(select=Name,Color,Quantity)"
This example will get list items with specific fields
Import-Module Microsoft.Graph.Beta.Sites
Get-MgBetaSiteListItem -SiteId $siteId -ListId $listId -ExpandProperty "fields(select=Name,Color,Quantity)" -Filter "fields/Quantity lt 600"
This example will get filtered list items with specific fields