You cannot perform Google App Script functions (gas functions) through the Google Sheets mobile app.
Alternative # 1 :
Create Android Add-in
Source: https://developers.google.com/apps-script/add-ons/mobile/
Android Android applications can use the Script application APIs to directly call functions in Script applications. This allows Android add-ins to receive and process data from a Google Doc or worksheet using standard Script applications. Android add-ons, like desktop add-ins, allow you to create user interfaces - but with the full range of Android platform features at your disposal.
Alternative # 2
Build a web application and use the Google Runtime API
Source: https://developers.google.com/apps-script/guides/rest/api
The Script Execution API application consists of one script resource, which has one method, starts, which calls calls to specific applications Script functions
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