Can be grid column adjusted the width automatically?

Hi:
Because our smart mobile phone’s resolution is different,i want adjust the width of the grid column. I try to set the width by percentage instead of the fixed number. An error occurred when i set the width by percentage.
code like below.
fields:[
{
id:“id”,
label:‘id’,
width:‘20%’
},
{
id:“Package”,
width:‘60%’,
label:“Package Name”
},
{
id:“Maintainer”,
width:‘20%’
}
]
Doesn’t the attribute of the grid column support the percent number?

Existing version of dhtmlx touch grid supports only fixed column widths