custum_enumerate

\documentclass[]{jlreq}

\usepackage[margin=0pt,paperheight=60mm, paperwidth=40mm]{geometry}

\usepackage[]{graphicx}

\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\usepackage[english]{babel}
\usepackage{blindtext}

\pagestyle{empty}
\begin{document}

\blindenumerate[3]

\renewcommand\labelenumi{(\theenumi)\ }
\blindenumerate[3]

\renewcommand\labelenumi{[\theenumi] \ }
\blindenumerate[3]

\end{document}