Maybe this will work?

_scripts/getReleaseNumber.mjs

@@ -1,5 +1,19 @@
 import { fetch } from 'undici'
 import packageJSON from '../package.json' with { type: 'json' }
 
-const latestRelease = await (await fetch('https://api.github.com/repos/MarmadileManteater/FreetubeAndroid/releases?per_page=1')).text()
-console.log(latestRelease)
+const latestRelease = JSON.parse(await (await fetch('https://api.github.com/repos/MarmadileManteater/FreetubeAndroid/releases?per_page=1')).text())
+
+const code = latestRelease[0].name
+
+const [_, latestMajor, latestMinor, latestBuild] = code.split('.')
+
+const [__, major, minor] = packageJSON.version.split('.')
+
+if (
+  latestMajor == major &&
+  latestMinor
+) {
+  console.log(parseInt(latestBuild) + 1)
+} else {
+  console.log(1)
+}