Create new calculated field

1. Let's add a Cost field which will be a calculated field - which will multiply "effort hours" by $100
2. For this in fields/index.ts please add this new field:

{
		calcType: 'calcfield',
		caption: 'Cost',
		dependsOn: ['c_is_billable', 'total_real'],
		jsCode: `() => (entity.c_is_billable ? entity.total_real * 100 : 0)`,
		name: 'c_cost',
		options: { formatting_pre: '$' },
		renderType: 'number',
},

3. And add this field to the layout in views/layouts/dashboard.xml - just after "is billable" field:

<field name="c_is_billable" />
<field name="c_cost" />

4. Let's install the app again

npx comind i app-basic-timelog WORKSPACE_ALIAS_HERE

5. Finally, see the form on web with this field:

6. If you mark "is billable" checkbox - it will auto-calculate Cost field: