You could input the number sequence as a string, and then use StringSplit() to put each value into an array.
"0.1,0.2,0.3,0.4"
It is your choice if you then further convert each value into a second array of type double, or convert at the time of usage
https://docs.mql4.com/strings/stringsplit
*Disclaimer: I use MQL5 so you will need to determine the MQL4 equivalent

StringSplit - String Functions - MQL4 Reference
- docs.mql4.com
StringSplit - String Functions - MQL4 Reference

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example : but I can't because 'lotlist' objects and arrays are not allowed as inputs
thank you: