I think you have option - I found case -studies in the following journals:
1) Robin M. Humble 2021. Canadian parents’ perceptions of COVID-19 vaccination and intention to vaccinate their children: Results from a cross-sectional national survey, Vaccine, 8 October 2021, In Press, Corrected Proof, Free access: Article Canadian parents’ perceptions of COVID-19 vaccination and in...
a) You could submit your work to this Vaccine - journal
2) He, K., Mack, W.J., Neely, M. et al. Parental Perspectives on Immunizations: Impact of the COVID-19 Pandemic on Childhood Vaccine Hesitancy. J Community Health (2021). https://doi.org/10.1007/s10900-021-01017-9 Free access: Article Parental Perspectives on Immunizations: Impact of the COVID-...
b) The Journal of Community Health is an option.
3) Alfieri, N.L., Kusma, J.D., Heard-Garris, N. et al. Parental COVID-19 vaccine hesitancy for children: vulnerability in an urban hotspot. BMC Public Health 21, 1662 (2021). https://doi.org/10.1186/s12889-021-11725-5 Open access: Article Parental COVID-19 vaccine hesitancy for children: vulnerabil...
c) BMC Public Health is another option.
4) Meltem Yılmaz,Mustafa Kursat Sahin 2021. Parents’ willingness and attitudes concerning the COVID-19 vaccine: A cross-sectional study, The International Journal of Clinical Practice, Volume 75, Issue 9, Free access: Article Parents' willingness and attitudes concerning the COVID-19 v...
d) The International Journal of Clinical Practice is yet another option.